I start with a glare. If that doesn't work, I straight up tell them to stop. Somebody's got to. Not cool when parents let their kids be obnoxious. Especially towards others.

Not really a sport person, but hockey's a pretty good one. Fast pace. And I'm actually conversant in it, lol. My son used to play when he was a kid (I was conversant long before that though. Grew up skating.)