[M&M Guy]

I'll throw in a few comments, fwiw. For every person, the line is different. There are a few absolutes that we all can agree upon, for example, "That call was f*ckin' horrible - you guys f*uckin' stink!" (Even if it might be true that night.) But what might trip my trigger might not be the same that trips yours. It might also change from night to night, and from beginning of game to the end, depending on the situation. I know that's not what you're looking for. But, maybe put it in these terms: how would you communicate with the person in your life you most respect and admire? For example, your minister/priest/rabbi, or your elderly grandmother, or your boss? If you feel a coach is using words, gestures, actions that you wouldn't use while talking to your grandmother, then it may be inappropriate enough to warrant a T. Another benchmark I sometimes use is if I wonder afterwards if I should've given the T, then I probably should have.

Z included a good comment as well - sometimes it's all about managing people. If you can talk them out of the actions or words, then so much the better.

Just remember a T is just another call in the game. You're not afraid to call a travel or foul, right? So you shouldn't need to be afraid to call the T if it's warranted.