Being hypocritical about sexism.
Hear about guy hitting girl: “what an a$$hole!”
Hear about girl hitting guy: “well, what did he do?”
Older man hitting on much younger woman: “what a creep!”
Older woman hitting on much younger man: “you get it girl!”
Making small penis jokes: funny!
Making fat jokes about men: funny!
Making short jokes about men: funny!
Making any jokes about a woman’s appearance: SUPER NOT OK.
Make no mistake, it's intended only to give them the upper hand while doing absolutely nothing to earn respect. Call 'em on it, and don't let them damage your self-respect. There are worthwhile girls out there, probably conservative, and they're the only ones worth giving yourself to.