It is easy to say Jack was silly to kick out like he did, but to be fair he was completely clattered by the other player, then wrestled to the ground and then had his leg deliberately trapped so he couldn't get up. Not at all surprised he got worked up about it - yes, he should have known that kicking out would get him into trouble, but I am convinced he was just trying to escape the wrestling hold the Wolves player had on him.
Personally I think he has been playing well this year and I suspect he will improve under Bruce.