I've had this happen at my DS's soccer matches. He's the size of a 7 year old, and has been playing with me since he could walk (in other words, he can be a little rough, and he's very very good (actually scary good---waaaay beyond where I'd expect a 6 year old to be and I've been coaching well over 20 years).....and of course they won't let him play up a year (where he really should be).
For his age group, coaches (me) are on the field with the kids, and a lady yelled something derogatory at him, which caused me to go off on her (luckily G didn't hear it---more luckily for her, my wife didn't hear it

).
Of course she went to the league administrator (who I've been coaching with for a decade) and filed an official complaint. Of course, she left out what she did--and that according to not only my parents, but some of hers, she had been running her trap the whole game.
It was shut down, but she persisted and took it all the way to the Commanding Officer (Base League). The CO took the complaint and told his Secretary..."Mike Lake....as in Mike Lake the NCIS supervisor?? Get that woman out of my office" and backed me up



The next Saturday, she and her husband intentionally walked through my warm ups and kicked a ball away from my players...unfortunately for him, I was standing there talking to his Master Chief (who is a friend of mine) when they did it....the Public A$$ Chewing right then and there was so spectacular, and so demonstrative that everybody out there on the field stopped to watch. My players (being 5 year olds) were like..."ooooo Coach, that man is in trouble"


It looked like a long walk back to the parking lot for him and his wife as the Master Chief unloaded on her too. Nothing like Kharma, and I have never seen them again

