If this happened in a Gogo bar, it's very unusual and I agree with the OP, not good at all.
However, if this happened somewhere like Jomtien Complex, I think it's important to remember where you are. A very insightful British tourist said last week while chatting at @home bar, that often Jomtien Complex feels like a social club. While 20-30% of people here at the moment may be tourists, the vast majority are expats who are in the same bars, with the same customers and same boys, most days, if not all days of the week. While not the case here, it's also important to mention that a large number of Asians who drink in Jomtien Complex are not there working, but out for a drink after work. Although many will quickly become a freelancer for the right price.
Jomtien Complex is largely an expat location. Hopefully a busy high season can change that.
Over the covid period, many expats kept these boys fed and housed (those that couldn't go home). I am still aware of a good number of Complex boys who are still living with farang, but working the bars at night. I personally am very friendly with a few boys in Jomtien, drink with them often, but it will never be anything more than that (they are not working there).
Would be interesting to know what the boys story is, if you see him again.
Either way, I hope this doesn't happen to you again.