@LT: Hmm. After I made friends with my introverted classmate I noticed that she already have her own impression of everyone in our class. She already took note of the people she doesn't want to be friends with even if she have not really known them (she might've been judgemental). So I suggest you try to be as friendly and harmless as possible. Make sure to respect their opinion and if ever you can't help but to correct his/her statement, try to say it as calm as possible and pick the right kind of words (nothing direct or indirectly offensive). If they get offended you'll notice because they might stay quiet or they will try their best to offend you (most of them are not very good at it though so they'll probably stay quiet.) after they do one of these they will avoid you. If you managed to stay friends with them for a days or weeks they will start getting comfortable with you.