If I see someone like this getting riled up, I hold their feet to the fire. Just see if you can help them closer to the edge. Exploding is cathartic for them. Play 4 safes in a row, shoot in a lackadaisical butt raised style while playing the "instructors" or play text book on the free flowing guys, etc. Unless the person is packing heat push them until they explode. On the table of course.
I've personally caused one very good player to break his brand new stick that he had just bragged about buying for $3500. It was his birthday and was a present to himself. I felt bad about that but I honestly played him fair and square. I've also beat a decent player and 2 minutes later saw him outside in the smoking area punching the side of the building until his knuckles were bloody. I never said one word to either of them before or after their little hissy fits and never mentioned the event to them after the fact. Just hit them with a constricting play style that tightens up the more they struggle.
It was some of the funniest shit I've ever witnessed. It's even better because I'm a nobody on the table until I am. I might be a touch sadistic when it comes to pool.
Emotional control and emotional intelligence should not be overrated when it comes to this game. As the poet once said "Check yo-self before ya wreck yo-self." This stuff is on each individual. Master it and it is beneficial. If I see a loose cannon, I'm just hoping for a spark to hit their fuse. And don't get this wrong, I'm not a tough guy, avoid arguments and fighting. I don't fight because if I'm actually in a situation where a fight is needed I don't like when the switch is flipped to the on position. But it takes something serious for that, I'm not itching for a fight in any way.
If I'm not taunting or disrespecting an opponent or sharking/whatever how am I responsible for them behaving like a toddler? Have fun with it. Highly situational of course, don't go antagonizing a scrapper and act surprised when you end up tasting blood.