Three rules, that if not followed I would get angry.
1. sub-par effort
2. Unsportsmanlike behavior
3. Talking back to a coach (regardless if they were wrong or an a-hole)
If the effort was there, I wasn’t as concerned with the results.
When son was 11, he asked me to not sit in the bleachers and stay in my car during the game. The previous day, we had a rather contentious father son practice. Our field had a parking lot that was elevated above the field. So I honored his request and stayed in the car. First time up he looked at a called third strike, I honked my car horn. Everyone knew it was me, parents and players. Everyone was laughing even my son. To this day it’s still brought up and we laugh about it.