Besides, have any of the parents tried to get to know any of their child's parents that they compete against? You might be surprised...they may be really nice!

What a great statement! My own son has met many great new friends by visiting with his opponents off mat and looks forward to getting to see them again. As parents we have met many many great people, cheering with them, etc. My philosophy has always been to not be negative towards other teams/parents and NEVER towards a child, NEVER!