I'm sureNever heard of that happening. Only guest related evacs ive heard of are when someone enters a restricted area and the ops have to e-stop it. Even then, if security can get the tresspasser out and maintenance can get the ride restarted pretty quickly (within 10 min), sometimes the ride can be restarted with guests onboard. Not saying it isn't possible, but how would you know someone is too short when the train is leaving/already left the station, especially when they already made it past an entrance, grouper, and platform team members? Usually, platform would catch them once they noticed they weren't sitting in the seat right, or they took off shoes that were really tall.
Usually, they only evac the guest in question and will restart the ride once everyone is out of the area.