Are men more homophobic than women in USA American culture? Are there
any surveys or studies to prove this?

Hi! Thanks for the very interesting question.

It seems that the general notion that men are more homophobic that
women is the US is widely accepted. However, it can still be inferred
that a significant number of women are homophobic.

In this survey of US American culture towards homosexuals. “In a
survey of 2,823 students from 8th to 12th grade, three-quarters of the
boys and half the girls said it would be bad to have a homosexual
neighbor. “ The article can be found below.

Studies Discover Clues to the Roots of Homophobia by Daniel Goleman,
New York Times, July 10, 1990
http://www.bibble.org/gay/phobia/roots_of_homophobia.html 
 
A survey in a Canadian school will support the findings about American
culture.
http://www.sws.soton.ac.uk/gay-youth-suicide/homosexuality-violence/04-youth-homphobia-canada.htm

More homophobia surveys
http://www.now.org/issues/lgbi/stats.html 
http://www.religioustolerance.org/hom_fuel.htm#poll 

Homophobia and Postcolonialism
http://www.emory.edu/ENGLISH/Bahri/Homophobia.HTML 

I included here some articles about homophobia that you might be
interested.
http://www.jasonwaltman.com/papers/homophobia.html 

Homophobia discussion in the military
http://www.amherst.edu/~qsa/Rhomophobia.html 

Gay Men: Homophobia And Health Care
http://alwaysyourchoice.com/homophobia.html  

Search terms used
Gender men women homophobia statistics

I hope this would help you in your research. Thanks for being a part
of Google Answers.

Regards,
Easterangel-ga

Thank you for such a great answer. I got more than I expected.