In my opinion, there is absolutely nothing wrong with having another opinion and posting it. But I think that there is something wrong if all people are negging someone just because he has got the balls to post his ideas. Poeple are different, that is a matter of fact. So let us accept that.
For example in this God vs. God thread: one user was apparently negged just for posting he is not going to church. That is not the style. We are heading to some sort of fundamentalism here and that is not for good.
But I also think that "c'est le ton qui fait la musique" so it depends on HOW you are telling the others that your opinion is different and you do not agree with them.