bras and breasts

A few days ago in class this guy said the stupidest thing I've ever heard. He goes, "Caitlin did you know if you NEVER wear a bra you will NEVER get breast cancer." I said "that's the stupidest thing I've ever heard." He gets all mad and says I'm stupid and I should look it up. Hm well my grandmother died of breast cancer and I know that a lot of breast cancer cases aren't usually caused by genetics, that doesn't mean just because I don't wear a bra I will never get it. Then he goes on to say, "well you most likely won't" at that point I was just ignoring him cause this guy is always trying to make me sound stupid. Then his friend who I actually dated for a little (I have no clue why lol) says "yeah but if they don't wear a bra their tits will be saggy when they're like 50" I honestly felt like I was losing brain cells just by listening to this conversation. Thought I'd share what I hear on a daily basis(: