I was out with a friend a few months a go, who does not like seafood. I ordered some crab rangoon. I offered him one. He said he doesn't like seafood.
I told him to trust me and just try a bite. He ended up eating most of them and now every-time we go out to Chinese, he orders them.
I've discovered as I've gotten older. It is not so much that I don't like foods, as I don't like ways of preparing it. For example I don't like cooked fish, but I love sushi. Seriously I can go to a sushi restaurant and spent $150 by myself. Something about cooking fish gives it a different taste that I don't like.