I get what you're saying and people on here do get... weird... about media. I would point out though, I think there's two factors playing into people's neuroticism about it.

1: there's some market logic to this behavior. If things I don't like get too popular, and things I like get too unpopular, the industry that makes these things will make less and less of what I like and more and more of what I don't. So there's a bit of a market incentive for fans to discourage fandoms of other things and promote their own. That's where a lot of the mockery come from. If I can make being a fan of bad thing cringe, there will be less bad thing.

2: media does have an impact on society. I think this impact gets a bit overstated at times, but it's there. A lot of these impassioned take down are coming from people who think modern media is having a detrimental affect on culture as a whole, heck certain people here think Netflix shows are turning people into psychopaths. Correct or not I don't think it justifies smug hostility towards people, but if it is true I get why people can get a tad heated by it.

Also Swift fans can be pretty culty, and I think some people think criticizing here will demystify her a bit and maybe get her fans to calm the fuck down.