im having a battle with myself, and i would like some peoples opinions.

Theres a girl in one of my classes who is very judgmental. No, not just judgmental; blunt, big mouthed, snobby and in sensitive. She consistently points out peoples [physical] flaws to them and tries to convince them to change.

For example, she is always pointing out that girls shouldn't wear boys pants, me being a girl who love guys pants because they are comfortable and don't draw attention to my butt, she also pointed out on day that wearing track pants makes you look like a bum. I happened to be wearing track pants that day. She doesn't just do it to me, she does it to everyone. Today she told a friend of mine that because of the way she dresses she looks like a boy. also because she has short hair and a mustache. The girl did not have a mustache, well maybe but not noticeable, the kind that everyone has where theres no point in waxing cause you cant see it. She is always talking about how girls SHOULD be, not just ladylike, but to the point where she would fit in in the 18th century. Dresses, no sports, that sort of thing. She has said girls should have long blond hair and be skinny. She doesn't accept peoples individuality and isn't scared to say it. She also comments on boys having long hair or Afros. Theres are A FEW examples, but you get the idea.

So after she said this, me being in a bad mood, I snapped. I'm usually a very nice person, I don't like confrintation and I hate judgement.
"Be nice to everyone you meet, they are fighting a battle you know not about."
But I reamed her out. She was doing a presentation in front of the class and the teacher stepped out and she was saying trying to tell the girl she was just trying to be nice. I spoke out [in front of the whole class, whom none of which really enjoy her criticism] that she was not nice, she was snobby, judgmental, big mouthed insensitive and blunt. She said she was just honest and not insensitive. I didn't stop and pointed out why I thought the way I did. I felt good for a moment standing up for everyone she put down, but she looked really hurt even thou she tried to pretend it hadn't bothered her. She almost looked like she was going to cry.

I started to feel bad, I had sunken to her level. I embarrassed her. Now I'm starting to feel really bad. I know I shouldn't have handled it quite like that, maybe told her she wasn't being very nice one on one. But She never bothered to keep her opinions quit.

Do you think I was being a total bitch or did she deserve to see how everyone else felt when she did it? Or maybe some where in between?

Be honest. It's okay to be blunt when people WANT/ASK FOR your opinion.