For more disparity in wealth distribution one only need go to Cambodia or Laos. I observed in Laos (2 mos. ago) not mega mansions but mini Palazio and medium sized Palaces in the middle of farm fields. Seem to be sprout up near a huge road project and around the time and route of the new Fast train. Jarring, really.
Why not? If you are in the far left lane and there is no oncoming traffic or people in the crosswalk (read safe) you can proceed to turn left. Unless, of course, there is a posted sign probhibiting this.
Never known "farang" to be derogatory unless preceded by "kii nok" and even then (by the wife) not really but certainly "ai eea"!
Rarely go to bars because of foriegners/expats/tourists ...I mean farangs!