It's funny, this is my first year as a HS b-ball referee, but I've been doing soccer (HS & club) for 20 years. I honestly can't believe how much better coaches and especially players are in b-ball games vs. soccer when it comes to dissent. Granted, I'm only doing JV/Freshman games, so perhaps Varsity is different. Sure, there are coaches that whine and complain, but it is nothing compared to soccer.
Fans are another story though; they're all bad.