These are things that disgust me when men do them, but that I'm pretty o.k. with when women do them:
Dating / Marrying someone markedly younger.
Ugh. Seriously, guys. It's disgusting. There's no person who is sitting there NOT thinking, "That poor girl is too young to know what an old man's wrinkled area looks like."
When women do it? I applaud, even if I have no other interest in the people involved. For example, go on with yourself, Mariah Carey. Good for you.
Peeing outside [not when you're camping, but when you're in civilization].
Guys, it just seems like you're trying too hard to be a badass and you just end up looking like a doofus who has bladder control issues.
Ladies? Pee away. That bathroom line is too long and if you can manage this and not wet your pants? You're a fucking genius.
Making a big deal about ordering your food.
I get it, people have allergies and preferences. But when a guy starts to pull a When Harry Met Sally, you know he's got a long list of Dos and Don'ts that you'd better follow, most of them dealing with not talking when he's talking or thinking and also what you should wear.
Gals? Order that sandwich just the way you like it. You don't need to ask twice.
Actually, I'm o.k. with everyone doing this.