What's the worst possible thing you can call a woman? Don't hold back, now.
You're probably thinking of words like slut, whore, bitch, cunt (I told you not to hold back!), skank.
Okay, now, what are the worst things you can call a guy? Fag, girl, bitch, pussy. I've even heard the term "mangina."
Notice anything? The worst thing you can call a girl is a girl. The worst thing you can call a guy is a girl. Being a woman is the ultimate insult. Now tell me that's not royally fucked up.