As a Sonic/Nintendo/Doctor Who/Mega Man/Pokemon/Most Things fan, I've learned that you just need to be confident that you like what you like. It's hard though, not feeling down when everyone else is shooting down what you like, especially when they are loud.
Ultimately I maintain the belief that you can like what you like. Don't expect others too, but at the same they shouldn't just go in hating it or attacking you for liking it.
Lord knows I barely mention what I like on the internet now, simply because the never ending negativity that is inevitable not only plays havoc with my depression if it comes in large numbers, but because I'm just apathetic to it all now.
Constructive criticism? Sure, all for it, that's the good stuff. I don't like something you like? Please respect my opinion, as I respect yours, I won't call it into question, because you are you, you like what you like. I do the same.