He's banning people for five minutes because he only wants friends on his server. There's nothing wrong with this at all, although he could have just set a password.
Really?Yes, it would be smarter of him to set a password, but it's no big deal. You're constantly joining his server which he has made clear he only wants friends on, then crying when he inevitably bans you. Stop joining and get over it.
It's not warboy's server.
His ID is 25077 if you want to ban him.