Many refs seem to be on a power trip and will not even let you state your case.
If there is a questionable call the coach should definately have the right to tell the ref (in an appropriate manner) what his thoughts are without being penalized.
If a wrestler does something wrong in a match we let him know so he doesn't keep making the same mistake. If a ref makes a bad call someone has to let him know. How else will they get better?
