Tiff wrote something on her blog that I've been thinking a lot about too.

"Be careful with people's emotions."

I say this to everyone, but particularly guys. Sometimes I wonder if it is merely because males are so conceited, or whether it's quite the opposite; that you're so low in self-esteem that you need a way to feel better about yourself. Because it's much more common to hear a guy say, "I'm awesome," or "I'm hot," or compliment themselves than it is to hear a girl say that, in my opinion. At least, from my experience. And it's a constant thing that I watch occur, guys calling girls "fat" or "ugly" and it's terrible, really. Because girls have extremely low self-esteems. Much lower that guys do. And girls don't put down guys most of the time, so why do you do it to us?
Unless guys really do just want to make themselves feel better, I say to you that you have no idea how much it hurts girls more than you know, how self-conscious it makes them. Saying that you don't like their hair or what they're wearing? It's not something people want to hear. Why be so honestly blunt? It's not necessary. -_- I would understand if they asked you for an opinion and you didn't want to lie. But don't bring it up if you don't have to. Where's your reasoning? Like in Bambi, "If you don't have something nice to say, don't say anything at all." Girls don't do that; girls are considerate. And if guys really ARE as self-concious as girls, I would expect you to understand how it feels to be insulted.
Don't do it. Pisses me off too. Both to see it and have it happen to me.