Most Thai girls can't drink more than one drink, I never buy them drinks, they stop asking after a while and leave you alone.
I never went into Thai Karaoke bars as they try to put a girl beside you and charge for her company, people should read the lonely plant b4 coming here if it's still up to date.
I went to a bar in Patpong years ago and I wasn't drinking alcohol at the time, then the most nasty gay sat down beside me and said '' you buy drink now' ''so I bought a can of beer and left it there, then when I went to leave I did not have any small money and gave her 1000 baht she wouldn't give the change back, so I pretended to ring the police and said tourist police coming ten minutes and my wife, they gave me the change and said farg off don't come back.
There sadly is this hustle still going on in Thailand