I don't REALLY believe that a technical foul type of call should be implemented. But if your team is giving away free corner kicks because your coach or some aggressive parent can't keep their mouth shut- I bet they get quiet pretty fast.
It would with the olders because they might actually score on a corner. The youngers can't even get it into the box and the corner rarely translates into a goal scoring opportunity. For the youngers, if you want to punish the parents, turn it into a mandatory goalkick for the offending team....given the high percentage most teams until U12 have for losing the ball on the goalkick, that might be a more severe punishment...but it would encourage on the boys side in particular coaches to find that really big kid with the big leg that can just boot the ball