Hockey parents are the absolute worst.
You run into shitty parents in any sport, but hockey attracts the frustrated assholes living vicariously through their poor kids. How many stories per year do we see about brawls or assaults at kids' games? Too damned many.
Gymnastics isn't as violent, but the parents are almost as bad. Usually the actual abuse is directed at their own kids.
Most 'fringe' sports have a strong, supportive community. It's possible, but the culture of hockey is rooted in toxicity.