Thai boy told me most farang are bottom

[moistmango]

I'll bet a nickel that the boy you're referring to is srt8.

If the boy was a gay fem boy (twink) I promise you he would have said that most (not all) of his customers are tops.

That said, sometimes demeanour-based assumptions can be way off. Once offed a twinky pretty boy from one of the Patpong go-gos, only to discover that he was a top.