since we don't have much in terms of your trip reports I don't know how and if at all you are practicing what you are preaching.
I did not comment about your experiences with your Thai friends. I just pointed out that you issue quite belligerent judgement about poster you never met and basically you don't know. It's akin to those who are hectoring about bars while claiming in 2nd breath not visiting any in last decade.
as for thread subject , when comes to tips there are 4 categories of posters :
those who tip generously
those who economize on tips as much as they can
those who say they tip generously while in fact they are stingy
and
those who pretend to be Cheap Charlies while on ground they quite lavish tippers.
And of course there are virgins who are extolling virtues of sex and their brothers, who preach chastity, while fucking everything that moves.