I agree with madsci, and Badbabe
madsci> is very right every body has the right to voice there opinion about what they like and dis-like and that you must take the good with the bad.
bad babe> is also right to piont to..that you should not just walk and trash an artist
I believe it is okay to say your opinion but try to voice in a polite way....for example dont go in to a britney spears lover thread and start dissing her because it will offend the britney likers....but what would work better is to say I dont really care for britney then give a reason so they dont give you a hard time. I know this does not always work but it is worth a try it is a way to voice your opinion with seeming like you are trying to push your views or opinions on them.
from another point of view say you have a liker/dis-like thread about an artist. you would not like it if somebody where to pop in an start saying things that offends you. "like your dumb for likeing that artist"...."or how stupid are you??...so and so is the best singer". basically what I'm trying to say is that it is important for us to respect each other. I know it maybe hard because I been in both situations before and had my opinions bashed but when it comes down to a little respect for one another goes along way...so ask your self is it really worth the effort?....if you know no matter what you say some will dis your opinion just try to ignore them. then soon you and them will forgit about the whole thing.
just so you all know I'm NOT taking sides just trying to help 🙂