Yes bro that is known case. The American and other tourists they are more into LB kind of stuff and like to experiment.
I guess the demand is high so the LBs are there! Also the type of ops they do nowadays its very very easy to get fooled. Last time I was in BKK, a friend cried the next morning because he accidentally poked a LB who was too hot to handle! A day to regret lah bro that was.