Thai's like to maintain a air of superiority about themselves but once a Thai girl starts smoking or drinking she stops caring what other people think. You want to avoid this girl because it's more than likely she won't care what you think either!
5. Loves spending your money
Unlike a good Thai girl who is frugal with your money, bad Thai girls love spending it. If anyone asks you to buy an iPhone, iPad, jewelry, expensive clothes, etc. Then stay far far away from that girl as you can.