I like the word "liberal".
It's very related to our soccer conversation.
Personally, I don't think there is a difference in quality of officiating between counties. Throughout my kids tournaments I've been in many different places and I can assure you referees are missing calls everywhere in the same way including the "liberal Marin county" (by the way, I am from East Bay).
But, In my opinion, it's up to clubs to make the difference in rising ugly situations in youth sport.
Working with parents and especially with coaches on what are the norms would help to bring those accidents to a very minimal. If a coach, before every single game, find two minutes go and talk to parents asking them remain calm when certain situation during the game can arise. And promise parents that every single case with bad officiating will be addressed and let them know the outcomes of it would really work.
And if a coach, before every single game, will go and ask parents to stay civil I am pretty sure coach himself/herself will be obligated to stay within the boundaries