I think it's a lot of things. General lack of respect for others, lack of understanding of rules, inability to put things in perspective, etc.
But mostly its parents being concerned about their kid and their kid only. Not understanding that the coach has 15 other kids that they're trying to look out for. Apparently this situation was because a parent was mad that his daughter got taken out of goal. She wasn't taking out because she was doing bad - she was taken out to give another girl a chance to play goal. Which is totally appropriate in 4th-5th grade lacrosse. So this guy laid into the coach after the game, the coach wasn't happy with the support she was getting from the rec council, so she said peace out.
We did have another parent step up to help coach, so hopefully all's well that ends well.
I'm glad someone stepped up. I live in Sykesville and if I knew anything about lacrosse, I would have offered. (My granddaughter plays high school lacrosse and even though I like watching her olay, I have no interest in anything else about the sport.)
I coached rec and travel baseball for about six years. The disturbing part if your story is the league not supporting the coach after she was pulled up by the parent. I bet the parentin this case was the father, the male vs. female dynamic makes a bad situation worse.
My suggestion to anyone coaching amateur sports is not to be friends with any parent whose kid you coach. You can be friendly, but you can't have beers with parents. Furyher, the other good rule is to have is that you won't discuss playng time with parents. The only time I wanted to hear from a parent was if the kid was going on a vacation or if they needed to use not playing on the team as a means of punishment. I hope after this episode, that the new coach doesn't entertain any interference from these too involved parents.