If he was just expecting to pay for transport then it's fair dos you mistook him for a client, any man who expects something for buying a drink or paying a taxi isn't someone you'd want to sleep on a non work basis. It's fine if someone wants to buy you a drink or you them to be nice, but if they make something sexual about exchange, then they've moved from flirting to purchasing in which case they should be browsing adult-work and doing things in an honest way. Sorry it really gets up my tree when people try and make you feel obligated to sleep with them. I never understand it like they think buying a drink for you will make you guilted into sleeping with them, surely they'd rather you came to that conclusion by yourself.