Not Thais but i have encountered Chinese MLs at RNT joints, and exchange numbers and met once.
I find RNT joints are far better to look for hookups than FS joints, i see the 'game' in picking up from RNTs.
I once met an innocent Chinese ML, very early 20s, got her number, been talking on we chat for a couple of weeks before finally asking her out on a dinner date.
Things got serious though, I was looking more for a one night stand kind of hook up relationship, but it was totally going off track.
So I decided not to respond after the night.

The thing with hookup is, most girls don't go for casual sex, they look for the connections, they want commitments.