I host supercar endurance racing at Daytona (50+ laps) with tirewear and full damage for adults quite frequently and I usually kick out the kids as soon as I hear them speak.
I will also kick out individuals who don't use Free Run properly, if someone leaves the pits to do donuts or drive backwards on the track then I will kick them without warning. I do allow Free Run to be used but only for practice, tuning, and race qualifying (fastest first).
I usually warn individuals if they are in the wrong car, (i.e. race car, race modified car, or a car that is simply no going to be competitive), if they ignore me or refuse to change their car the I will kick them.