There's a multitude of reasons of why people act the way they do towards other peoples opinions. Especially when you don't usually agree with what seems the most popular opinion, even when you approach that sensible without trying to be antagonizing. People get real passionate about the things they like and it manifests into something they must defend till the end of days.
You just have to come to realize that on the internet or anywhere for that matter, you're going to be be met with this kind of thing and you just have to be aware of it. If you feel like people are only arguing for the sake of arguing or are just a fanboy about something when replying to you, then don't even indulge in the conversation and move on. There's nothing you can do about it, so there is no point in wasting energy and being frustrated about it.