More and more tourist problems occurring in Phuket (several friends call it Fuket. Probably a mispronunciation but who knows).
There are good Thais and not so nice. Not more than the UK or USA.
I always get the feeling that poorly educated people feel westerners are all so rich and should pay more.
(Many feel that UK pensions are 'free' money provided by the government so why are they so stingy?)
Perhaps preparing the fare in advance 'to the baht' means jumping off, paying and walking away rapidly. I would not argue violently over a few baht because i don't know how many of his friends are around, but report the licence plate number to the police and Grab