Well, you see, sometimes a hacker hacks in a game, but he can report people that hackusate him, if he got away with it. It's not impossible to get away with just one round. There's no proof the player was hacking. Instead though, I guess you could block the word hacker, haxer and all that and say "Don't accuse anyone, record and report them at reports.cubecraft.net". Because, really, you don't need a warning to get a hacker banned. Also sometimes people can't really tell the difference between a person with high ping or a person with reach. I'm neutral with the mockery part and would count it as bullying if any case, but hackusating can't be a possible rule, really. You can also take any hackusate towards you as a compliment to say that you're really good, or a hint to get better connection. xP
Edit: you can always report them in case if they were spamming. c: