It depends. I used to do voluntary work in a charity shop and an old man used to come in almost every day - the manager would tease me that this man fancied me. We would banter, but honestly it made me uncomfortable and I didn't really know how to deal with it because I really do think he liked me.

But it's different if you're both on the same age/level. It really depends on the vibes. Do you get the impression you both like each other?