I don't usually like to play with kids because I don't like to hang out with kids. If this was ten years ago, it would be creepy for a 30 year old dude to hang out and play Super Smash with a bunch of random kids he didn't know that are 1/3 his age. It's weird. Second, I was a little shit when I was a kid, and I knew every damn thing. I don't expect them to do different, and that creates problems when they are doing something wrong and won't take advice. There are plenty of adults that do the same thing, but it's a smaller pool. The lower the age, the greater chance of that happening.