How does prejudice affects people's integrity?

Depends on the person. Some people can balance their own feelings and
remain fair and honest in their dealings with others. Some people, on
the other hand, can't see beyond themself.

Depends on the type of prejudice too. Some prejudice is justified,
such as one's favoritism of their own family over others for example.
Where racial or gender prejudice is concerned however, I fail to see
how a person who is prejudiced can claim to have any integrity in the
first place.

tutuzdad-ga

You're right about that. Everyone is prejudice to some degree. But
when prejudice leads to hatred or envy, then that person has entered
into emotions which are dificult to control. I think most of us
despise people whose prejudices are based simply on race or gender.
Does that not make us prejudice? Does that mean we do not have
integrity. No.
It's up to each of us to stop racial and gender bias in its tracts.
When some one expresses such bias, you can stop it by stating you
don't care for it. Most people express bias simply to get approval. If
it no longer get approval or acceptance, they stop.

We all have prejudices, some persons have seriously politically
incorrect ones and some have ones that are harmless and appear to be
humorous to others.
I think it is a question of how we deal with them, whether we express
them and obviously let them affect our inter-personal actions.  (Of
course, there are also prejudices that are not inter-personal.)
"Integrity" is not a clear expression in this context.  I could accept
it as a sign of integrity if a person whose family had suffered from
the holocaust had prejudices about Germany, but I would find it
inappropriate if the person expressed opinions indicating that he or
she therefore felt that all Germans and everything German was bad  (an
extension of Tutuz's example).

Thanks for all your comments but I think my question is not clear
enouh. O.k, lets say I am a prejudist person and I dislike others for
whatever reason (race, religion, color, gender) you name it. How would
it affect my integrity now and in the longrun.

Will affect in the way that you will loose the opportunity to really
know others or even to really choose what you want to do. Let's say
that you want to buy something in a store but the only person in
charge is a person that for x reason you are prejudice from right?
what you going to do? if your type of prejudice is the one that you
prefer to come back again later or just don't return to that place
because of that, and what will happen if that is the only store to
sell that item that you are looking for?  got me? you are the one who
are putting yourself out of the equation for a matter that you can
domain your views and get probably more information about WHY you hate
or dislike that type of person. Sooner or later you will be put
yourself out of many opportunities. "prejudice" is not "favoritism"
and are not in the same status.
And as will affect your integrity; every person can have different
factors that define if they are an integrate person, some will say
that honesty, loyalty, etc...but to what? a person with prejudice can
have honesty, never lies, never comitted a crime, but as part of the
society and as an universal being I don't think so. Prejudice can come
in many forms and even in few, little or higher level we all can have
some but is up to us to dominate it or take advantage of our
inteligence and search and learn the why and make steps to solve it.

Thnk you Cherr, now I'm starting to understand this better.

The definitions of "prejudice" and "integrity" in Webster's Dictionary are, 

Prejudice:  "An opinion or judgment formed without due examination;
      prejudgment; a leaning toward one side of a question from
      other considerations than those belonging to it; an
      unreasonable predilection for, or objection against,
      anything; especially, an opinion or leaning adverse to
      anything, without just grounds, or before sufficient
      knowledge.

Integrity:  Moral soundness; honesty; freedom from corrupting
      influence or motive; -- used especially with reference to
      the fulfillment of contracts, the discharge of agencies,
      trusts, and the like; uprightness; rectitude.

So it seems clear that one's prejudices always will have a "corrupting
influence" on one's  "moral soundness," whether one realizes it or
not.

I think it is almost impossible for any honest person to claim that
they are entirely free of any prejudices. Prejudices are inculcated in
us, from the time we are born, by our culture, national origin,
family-of-origin, religious affiliation, education, peers, etc.

What one must do is examine one's attitudes and beliefs and seek to
discover which values, opinions, expectations and assumptions are
biased by  unconscious, unreasoning concepts that have no basis in
actual reality. Only once you realize that you are prejudiced, do you
have a chance of eradicating your prejudices, of escaping and
overcoming them.

So, to answer your question, I think one's integrity always will be
limited and distorted by one's prejudices, in every aspect of one's
life. Opportunities will be lost, judgments will be distorted, choices
will be limited, or skewed.

Your prejudices can affect how you vote as a member of a jury. Who you
think ought to be hired, or not. Which neighborhood you choose to live
in. Who you are kind to, or treat cruelly. Which books you read. What
types of music or art you appreciate, or avoid. Who you let your
children associate with. How you vote in an election. How you address
others when you speak to them, or if you speak to them at all. Who you
choose to sit next to, on a bus, or in a restaurant. What kinds of
foods you will eat, or not. They can decide whether you become part of
a howling mob, or work for charitable causes and social change. They
can effect which social changes or programs you support or oppose.
They can limit your choice of friends, or of a spouse. Who you blame
when things go wrong. Whether you support the death penalty or
euthanasia, or oppose them. What educational programs you accept or
reject for schools. Who you expect to be dishonest, or to tell the
truth. Every aspect of how you treat others, or expect them to treat
you, is affected.