A rather unique question

[tarheelcoach]

Since I coach and also officiate, I have worked with plenty of guys who I saw from the 'dark side'. Once, during basketball, I got my only official warning of the season, and then the next day worked with the guy who gave it to me!
I didn't apologize, just told him that I deserved it. He admitted that what I got too excited about was justified, but he kicked it. We laughed about it and moved on.
As long as your not ugly with someone, then I don't see it as a problem - just don't do anything that would cause someone to hold a grudge.