The moderators should deal with silly stuff like that. Bring it to their attention and if they judge it to be inappropriate they'll remove it.
But consider for example if someone had said Magnus Carlsen is the greatest player ever and you didn't agree with that and decided to block them. Is that fair?
What can I say, the people have spoken
Blocking is, I usually find, a juvenile way to avoid dealing with contrary opinions. There's no mechanism to protest the stupidity of blocks, which is why we get situations like TheGrobe making a perfectly valid suggestion in one of Karl's threads, who then promptly calls it hi-jacking and blocks him.