that I seem to have an inate distrust of men who are very attractive?

Example- today in one of my first drama classes a very fit guy (who my best mate had been admiring in the student bar the other night) For some reason I assume he is an arrogant, shallow prick, I hate that I can be so judgemental of someone without even speaking to them. I obviously intend to actually get to know him before I really have an opinion of him. But why does my mind immediately jump to the conclusion that any man who is undeniably attractive must also be a prat? Is this the influence of my school days when the 'Cool good looking' boys were nasty to me?

I also automatically assume these tyoe of mens taste in women. Is this founded at all? Am I just a cynic?
I thought I was an idealist :(