Well i'm Asian American....so while I am a Farang, I look like i could fit in.
I had one experience, where at Hollywood I was given nasty attitude when i entered at 10pm and took a peek inside to see what it was like....one of the bouncers there noticed me just looking around and gave me attitude. I certainly felt he was looking for a fight. He basically asked me what I was doing here and to come back later (well the sign said it opens at 9). I just told him I was just checking if a friend was there and left. It was nearly empty at the time.
In retrospect, he might of thought i was a Thai guy and wanted me to leave..my assumption is that because locals don't have money, they want you out. (i had to prove i was not Thai to get into go-go, so I thought that might be it)
Aside from that one experience...i didn't notice Thai doormen being more aggressive or looking for a fight...in fact i think they're much more calm than American bouncers at clubs in the states.
Now, I did notice a lot of aggressive rude/drunk Aussies, acting in a manner that they were looking for either a fcuk or fight....whichever one they don't really care. Maybe for every 100 farlangs i saw that were behaving civil, i would see 1 drunk ass obnoxious farlang on bangla.
However, this is definitely not the case at MTB.