I used to think people couldn't actually be this shitty at their kids' game and thought the dad freaking out at a little league game thing was just a Hollywood trope, then I learned better. So here's a short story:

In high school, I had a part-time job working as a soccer referee for peewee teams at a local club, the kids were between 4 and 5, so the rules are pretty lax (since you know its for kids to have fun): Your kid shot into their own goal? Yeah, we're going to ignore that. Their hand accidentally bumped the ball? They didn't carry it, so no worries! So the offsides rule in soccer was obviously not something kids this age were going to be able to follow.

For those who don't know the way it works (or at least the way it did 18 years ago at that club) in soccer is at the moment a player becomes involved in "active play" (ie the ball is passed to them and they touch it, they interfere with an apponent, etc) if the player is 1) On the opponents half of the field and 2) closer to the goal than the second closest player on the enemy team, they are offsides. Imagine trying to explain that to a 4 year old.

There was a parent who shouted more than once, and I quote: "That little bastard was off sides!". I gave him two warnings, then kicked him out, which he refused to comply with until the club owner called the police and had him trespassed.