I am looking for a full quote and citation for (approximately)this sentence "a
man who walked down the street calling things by their proper name [or
telling the truth?] would be struck down before he reached the first
corner."  Possibly Lord Dusany, or some other British artistocrat. 
Can anyone provide it?

I could not find your quote online. It sounds familiar, and somehow I
associate it with G.K. Chesterton. I hope another Researcher will be
able to help.

"He that would speak truth must first have one foot in the stirrup."
(Tuurkish proverb)

"A New Dictionary of Quotations on Historical Principles from Ancient
& Modern Sources," H.L. Mencken, ed., (Knopf, New York 1962) at p.
1227.