It is a bad situation. Unfortunately many LL guys want to go outside and control everything. I have a HS ump that wants bigger games and to move up to college but then he will do something like this in a varsity game. I saw him eject a fan last year. It cost him getting good games because of it.
As to the thread itself, it sounds like a lot to do about nothing. People standing behind the fence isn't that big a deal to start with. I would have a bigger problem behind the plate but not centerfield. I figure there are enough things to worry about on the field I don't need outside too.