Listen up, this is important.
I just had to un-friend and un-follow someone because he would not bashing one of my interests, so let me be as explicit as possible:
It's perfectly okay if you don't like a thing that I like, such as ponies or shooting or goth or role-playing games. That's a matter of taste, and everyone's taste is different.
It is categorically NOT okay to insult and belittle PEOPLE for liking a thing which you don't like. That's an unwarranted personal attack.
There's a huge, huge difference between "I think this thing is stupid" and "I think you are stupid for liking this thing." Not only is the latter rude and intolerant, it's also incredibly hypocritical if you have any interests outside of the mainstream, such as, oh I don't know, IDPA/IPSC competition shooting.
I mean, if you object to the supposition that owning guns and liking to shoot them means you are a violent and deranged individual who is just itching for a chance to murder someone, then what are you doing by suggesting that an adult who enjoys a wholesome show about magical cartoon ponies is creepy and immature? Aren't you just spreading the knee-jerk hate? Aren't gunnies supposed to be inclusive and welcoming?
In conclusion: Don't be a dick about the things you don't like.