I’d have kicked him out after he made his little mess. Yes, you may or may not have gotten his order wrong (personally, I don’t care if it’s off by a small detail like medium drink not large), but that does not entitle people to act like little asshats.

The writer probably didn't have the authority to kick them out.

I think EVERY employee should have that authority. It’s one thing for a customer to get a little mad that they didn’t get close to what they want, but when they become belligerent little shits like this guy and make a scene… instant ban, even temporary. Especially since he actually came back and made it worse.

These are the kind of 'customers' who need to be told to NOT come back.

Well, get the orders right! Best solution.

That’s assault...

I hope you defended yourself, and made the customer share in your mop water mess. That's ridiculous. Some people never grow up.

That’s absolutely absurd and childish. File a charge against him/her for that much harassment and trouble. Even if you did get their order wrong, that’s way over the top

I hope you know his name so you can charge him with assault.

That's assault and he should have been arrested.