From coaching baseball, my biggest pet peeves are when umpires (a) don’t know the rules, and (b) are condescending and refuse to discuss things with coaches. Yes, they have the final say, but that shouldn’t mean they refuse to engage with coaches. I can live with a questionable call if they discuss and clearly know the rule. Some umpires take the “because I said so” approach, and that’s what bothers me. If a coach approaches an umpire or referee respectfully, I think they should be willing to give them an explanation and then move on. And as others have said, if you feel like you got one wrong, just admit it. I’ve had umpires do that and every time it happens, it immediately makes me feel better and respect them, and it puts an end to any lingering argument.