The refs are doing nothing wrong. It’s clearly stated in the rule book:

An official may assess a technical foul, without prior warning, at any time. A technical foul(s) may be assessed to any player on the court or anyone seated on the bench for conduct which, in the opinion of an official, is detrimental to the game.

So they have opinions and are exercising their opinions at any given moment. A ref can just go: “Technical foul! Annoying face detrimental to the game!”