Assistants yelling, standing up

[notredame_999]

I officiate a middle school league on saturdays that uses high school rules. An assistant stood up and yelled at me I told him as an assistant he needed to sit down, and for the remainder of the game only the head coach will address me. I told him this is high school rules. To be honest though, I don't really know the high school rule regarding assistants. I know they are required to sit down, but are they allowed to yell at the officials during the game (not a timeout)? Are they allowed to call out plays and instructions to a team on the court during play?

I just can't find this in the rule book. I'm a young offcial so any help would be appreciated.