Personal opinions combined with mob mentality. Its uncool not to worship them, or in situations like this, to not profess your dislike, because we disliked them all along, right?
It's topic I like to rage about every once in a while because this Forum is notorious for this way of thinking.
If you don't like Radiohead, it's an opinion, and its yours. Other peoples feelings on the subject should be irrelevant, so build a bridge and get over it. There are far more people who like, oh, say, Nickelback than Radiohead, so why not replace every instance of one for the other in your original post.