That was pretty stupid.
I actually don't mind some of the Ts when players get overwrought about something, but taunting in a way that the refs can see is really dumb. I much prefer the Larry Bird approach - just casually tell the opponent he's outclassed. (There's a classic Bird story about the first 3-point shooting contest at the NBA All Star game, when he walked into the locker room, looked at the other contestants and said something along the lines of "So, which of you guys is going to finish 2nd?")