Me too ... and I **** you not, his name is Homer :)
They wanted me to bring in my Jeep for a service ... I told them how will they arrange pick up and drop off, via ship or plane ... apparently SA humour is lost on the Americans
Ok, so my take: "Stop driving like a p**s" is acceptable ... it is comparative.
Your second statement: "jou p**s" is more problematic ... could open you to a charge of crimen injuria.
Next time rather go with: "ek DINK jy is 'n p**s" ... it is your opinion, and nothing he can do about that