I have yelled at other parents many times over the years while coaching. I've sent out the "your kids are not allowed to listen to you during games so don't bother yelling at them like a lunatic" email several times, and many times I have followed up with specific parents by saying "you know that was directed at you, right?" Even as a fan I openly mock the harsh parents. Every time I hear something overly critical, I usually follow it up with an even louder "I think you're doing great". I'm genuinely surprised they still want to have beers with me after games.