The situation I remember most was an 11u game during fall ball. The whole coaching staff was a bunch of jerks, and ended up getting kicked out of the league at the end. (Not for this specific incident, just everything added up until something broke the camel's back.)
The manager came out to argue balls and strikes with the home plate umpire. (Yea, thats a no-no.) So while the PU was occupied with that, the coaches in the dugout started to head towards home plate to join the manager. I cut off the coaches, told them to go back to their dugouts, and to "not start." Well, the one smart mouth said, "Listen kid, Im 35, and your 16. Don't tell me to not start." I ignored as I kept shoo-ing them back to their dugout. When they got to the dugout, the same smart mouth said, "Ok we are here, now get back to your position." to which I replied, "You don't need to be telling me what to do!" He then took my name and number blah blah blah.
The manager ended up getting EJ by the PU for arguing balls and strikes.
Poorly handled on my part? I think so. The coach brought the conversation to a personal level and I followed. But, I have learned my lesson.