My recent coaching experience;
Even though I didn't have on a vest, riders don't forget you are a coach... even if you are just riding for fun as a paying customer.
I have been warning a rider that he is near the edge of crashing for 3 track days as such. I have pulled him in and let him know, I have chatted with him the paddock about it multiple times, I have lead him around on track to show him a safer line.
Yet... he still keeps adding lean + throttle to correct line issues post apex. Not sure how to help him, he is going to crash... it's a matter of time.
But he won't listen.