This post boils down to an ideal I've seen far too many times.
"Stop liking things I don't like."
Description- It baffles the person with this thought processes, how anyone can like X since they don't like X themselves. Usually people with this mentality have an over inflated belief in the value of their opinion. They cannot be wrong, so seeing many other people with an opposing view against their own, jars their perception of reality. Unable to even think that there is any possibility that they could be wrong, or misjudged X, or the even more simpler answer- different strokes for different strokes-the person places himself above the masses and even, in some cases, attempts to persuade the opposing side as to why they are wrong and he is of course right.
Possible counter-actions- The most effective is to ignore the person and not let his rhetoric bother you. You understand not everyone enjoys the same things, so allow him a chance to state his case, and move on with your life embracing the very thing he hates. Of course, when this person states things you can 100% disprove with facts, it gets harder to ignore. An opinion is not something that can be changed, but lies can be revealed. However, people that believe such lies also believe that they are never wrong, so this would be an exercise in futility and just an aggravation for yourself. Again, it's just best to ignore, let the person enjoy his hate, while you have fun.
Now this happens many times in life, whither it's sports, politics, religion, or video games. People simply want other people to agree with them and anyone else who doesn't is wrong. Instead of worrying on ways to make them see the light, or to at least, take a less hostile stance on the opposing viewpoint, just walk away, slam the door, or hit the ignore button.