Assistant Coaches

[umpharp]

If the asst coach was chirping over and over about the same thing, I would call time and go and talk to the head coach. I would tell him/her that you have heard enough from his asst and that it is time to move on with the game. This puts the responsibility back on the head coach as the head coach can not say that he didn't hear his asst or know what was going on. A head coach should be the only person we are discussing calls with, getting subs from, arguing with, etc.
If the head coach does nothing and/or the asst coach continues to chirp, then you could A) give him a stern warning yourself or more likely B) Toss him. You already told the head coach that you had heard enough. It is one thing for a head coach to question calls or argue, we don't need it from the asst.
As already posted, a good coach will have control over his players and asst's.
As for parents, let them chirp all they want as long as they don't say anything vulgar. I often laugh at the things I hear parents say. I expect more from coaches.