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Lately a server I go to has had this plague of a kid. He's 13 and EXTREMELY BUTTHURT, possibly the worst case in minecraft. He constantly comes back pouring lava and water over everything and in general being an annoying douche.

Sure we can easily use a backup but it undoes some work of legit users and is kinda tedious.
How can we stop or at least slow him down? Don't wanna disable water or lava as they make the game more fun and I don't wanna do some sort of spawnjail because I like to trust everyone at least once.
Edit: Oh boy, he's using that program that bruteforces passwords and got in my account and other admin account.