They blow calls. It happens. Just like the strike zone differences, players need to adjust.

Leaving early or leaving late. Slapper running in the field of play interfering with catcher throw, catcher blocking the plate (sort of), SS impeding the runner but no contact, infield fly rule but ball in grass, bang bang play anywhere, and of course "she dropped it on the transfer".

Are you going to teach your kids to whine and complain, or adjust and move on? Being an umpire isn't easy and with all the crazy coaches/parents the pool of good umpires is getting less and less...