The last sentence is 100% a thing. I know people who will NEVER coach or ref again because of people like this. Most of them are doing it to be nice and make sure games get played for the kids, but they don't make enough money to have to put up with the abuse of these parents.
I've coached youth sports for years (up through 6th grade basketball - finally done now though), and you'd be amazed at what you have to put up with.. .and this is a volunteer position as no one else would do it, so i'm doing it just so the kids can even have a team.
I know it's a thing. I'm one of those people. I probably wouldn't be any good at it but I wouldn't mind officiating high school basketball. It was fun doing the rec league in Ames and I never got beat up so I must not have been awful. The problem is I sometimes go to high school basketball games and I'm just not going to put up with that while I all but volunteer an entire weekday night.
I don't know about coaching as you don't see a lot of that but I can't imagine it's much better since that's not for the whole public to see. The thing that really bothers me is I rarely see a kid act out and they're the ones that are supposed to act out and learn the lesson.