Losing friends

So I had this lifelong friend, a guy I've known since I was a teenager. He finds out what my interests are because I told him that I was going to a convention this weekend, and boom, he thinks that I've lost my mind and so the argument begins. In the end he calls me a bad, no not bad, a shitty mother, and says that what I like is sick. So much for life long friends.

I don't understand why some people are so closed minded and so judgmental of others. Just because it's not their thing? For real, I feel pretty lousy that he was so mean, really said some hurtful things....but I won't get hung up on it. There's too many positive things going on in my life today to let this bring me down. For hell's sake, I can bring myself down just as easy and without being mean to myself, lol.