I don't like it. I'm not a fan of trash talk. But I know it's part of the game, and at this point two of my favorite Celtics ever are also two of the biggest trash talkers ever, so I deal with it.
But those guys were MVPs who could back it up. Crawford is a castoff who played zero minutes in this game.
If you can't back it up, you keep your pie-hole shut.
That's my rule anyway.
(I will say that there's something to be said for a bench guy trying to goad the other team's best player into a tech or something, but I don't give Crawford credit for being that smart - for one thing, the game was already over. I think he was just being a punk).