I have nothing against people disliking things, if you want to voice your opinion on something, go ahead. What I don't like is people making harsh/rude/underhanded comments about whatever it is they don't like. I mean, you might not like it, but somebody else does and not everybody is thick-skinned enough to take rough comments on the chin. There's nothing wrong with saying "I'd rather prefer [example]" or "I don't particulary like this", but when you make a comment that is loaded with CAPS and swearing or is underhanded and mean in an atempt to make yourself sound cleverer, then you can GTFO.
Actually, if you don't like it, why the hell are you commenting in the first place? Nobody else wants to know that you don't like it, and just makes you look like you have nothing better to do. Go and comment on things that you do like and let people get on with their lives.