Poor little fella, he's lost control of the "relationship" and is acting out. He thinks if he insults you and your work, while dangling the carrot of a tip, you'll cave. Brothel, LOL, if you worked there, you'd have taken your fee up front.

I suspect that's probably how he does business generally, when he can get away with it.

Block the clown and let him go back to the "brothel" to find someone else to take his shit.