In the last week:
Being expected to pay a limbless beggar 100 baht just because I'm the farang.
I overheard two women at Mo Chit BTS talking in Thai behind me and criticising me thinking I didn't understand them, because I gave nothing to the obviously mafia owned beggar at the bottom of the escalator who holds a microphone with two hand-less stubs for wrists whilst singing crap songs.
A motorbike taxi that pretends not to have change of 100 Baht because he thinks I'll give him the whole note instead of going to 7-11 to get him the change needed to pay him his 20 Baht.
Ditto a taxi.
Then again, I blame the tourists who have set the precedent for that kind of behaviour by giving massive tips, then these pittance-earning-monkey-peasant-attiuded tossers wouldn't assume as such.