One of my closest friends laughs at all the guys I date?

I don't know what to do. We've been friends for a long time. We used to have good times together and be inseparable. But, now we can barely get along because she always insults the people I fall for. She always makes fun of me for liking them too. Like one guy I dated was super tall and had a thin but muscled look. she laughed and said "Where did you find that pedophile? Behind an ally?" I got so embarrassed. another guy i dated was asian with the emo boy band hair. She said "he is pig faced like every other asian and hes really fat!" So what if he had a little flab instead of muscle? She is like that too and much fatter than he was. now im dating a wonderful guy. He is mexican and a little shorter than i am. She laughed when she saw him and said "Jeez! He has such girlish lips! I couldn't kiss him! I'm sorry, but, I think I would feel suffocated!" I can't stand it! every time I am single and I meet a new guy, while we talk she will just blurt out "She only dates nerds! Don't get your hopes up!" and one day when we were at the beach together she smiles and pointed to a complete nerd and said "I see a guy you might like!" She has only had one boyfriend and he just happened to be one of the popular guys. He is arrogant and makes fun of me. When I make fun of him she gets all mad and yells. A lot of my friends say the guys I date are cute. Yes, sometimes I do date "not-so-hot" people. But, they are what everyone would call your everyday guy. Not hot. not ugly. not fat. not skinny. sweet. but sometimes jerkish. Why is she this way?