I umped baseball for 10 years, if you had to throw out an entire section of parents that is v bad and probably somewhat your fault for being confrontational.
I didn't have to throw out an entire section. Their problem wasn't really with me. They were trying to start fights with the parents on the other team. They were both tourney teams so they saw each other in league play and tourneys. The parents for the better behaved team told the other parents to get over being pissed about the strike zone because it was little league baseball. The other team's parents got pissed at that and started being really aggressive with the better behaved team. I wasn't about to be the umpire who allowed a brawl to break out behind him without tossing parents, so I tossed 6 of them.
I was never one of those umps that made a scene about throwing people out. I would calmly walk up to them and say they had been ejected and they had to wait for the game to be over in the parking lot. Some coaches want the ump to scream while ejecting them so I never fed into that stuff.
I had one coach who was notorious for getting ejected one time try to pull every trick he could to get thrown out of a game when it was super hot one day. I walked over to him and told him that he should save his energy because I wasn't about to throw him out so he could go sit in the A/C in his truck while we were out in the heat. He looked up, laughed, and told me that it was worth a try.
In the early days when I umped that age kids, my zone was the size of north dakota. swing the bat or you're out.
I was the same way. I told the kids that if it was below their shoulders and just above their knees they should be swinging because I would call it a strike. Those walk-fest games drove me crazy. Never had a parent or coach that had a problem with that policy. Most of them loved it. I had parents that would get excited when they would see me because they knew I was really good about finishing games before the time limit.