I remember reading an article about a guy who let his kid (really young at the time) play GTA and he would just drive around, stopping at all the stop lights and following all the traffic laws (to the best of a little kid's understanding anyways)
But yeah I played all these games as a kid and I turned out fine
As for kids on mics, it's not the high pitched voice that annoys me
It's the fact that a lot of kids tend to be stupid, annoying stuffs.