A button to block players you don't like
No, just no. Deal with people you dislike and learn to tolerate people.
But no blocking button, I always hated when people used that. You can't always hide from people you dislike in real-life so why should the internet be any different.
While I don't disagree with you Fireplay, your argument is really flawed - comparing the Internet to Real-Life.
The biggest problem with a blocking button is that we have a forum system with direct replies. What would happen if a bunch of users you hadn't blocked replied to a user you did block?
Well, you could block their PMs to prevent harassment if that sort of thing was going on, I guess.
You should be able to block players from your game, but not from the forum