"How dreadful!" cried Lord Henry. "I can stand brute force, but brute reason is quite unbearable. There is something unfair about its use. It is hitting below the intellect." ~ Oscar Wilde - The picture of Dorian Gray
I've had a couple of rather naughty students who I think were ENTPs (extreme versions of it in some cases). It helped to show that I am not easily offended. Some of the abrasiveness from these students was not intended as being out of line, but their minds were going so fast and they had such energy, that stuff just got blurted out.
I found that trying to control or box in such a person is a ridiculous waste of time. I give them the reigns to a large degree by asking them specifically what would enable them to get the best results. If the out of line behavior is limiting them from their goal, then that is worth pointing out. More than being nice or nasty, I think being direct, reasonable, and non-controlling are the key to gaining most anyone's respect, but especially in this case perhaps?
Heh, I know of an ENTP friend like that. He enjoys saying shocking things just to get a raise out of people. In some ways that's a game for him.
Being direct and reasonable works... also at the same time demonstrating that you know it's a game and just laugh. Shared laughter works in many things.