I as a parent get frustrated over bad calls, but I try my hardest not to voice it. Sometimes, I will admit I don't succeed and I do apologize to my sons. They know who they are. I do not like to see coaches yelling at their wrestlers on the mat after a loss. What I do like, as an example the Clearwater High School Coaches, they talk to their wrestlers. If they actually yell at them...I don't know, only their athletes can answer that. And to see a parent yell at their child for lossing, you can blame them as much. A parent needs to be as dedicated to this sport as the athlete and to be their moral support. If the wrestler decides to go all out and be dedicated then stand by him/her and encourage them!