stevelev
Journeyman Pro
Unfortunately he can't take advice from anyone once he gets into that sort of mood and if you mention it you're just looking to get both barrels.
If it was me I'd have the word next time I went to pick him up. I wouldnt let him in thr car, and I would let him know that I was really miffed last time. And that if he even starts again you will report him, you will leave him at the course. If he says he thinks your his mate put it on him and ask him how he would feel if it was you doing it, if he cant see sense leave him at home and give him time to think.