well, as a guy. I cannot say this for all men, but I have a three prong rule
1.unless a girl visibly flirts with me FIRST, (and it has to be dead obvious as I am dense) I will make every point to only appear as a possible friend.
2.if they are a work person, such as a waitress or someone working at Fast Food joint, I immediately avoid any and ALL flirtatious comments. It is simple really, they are PAID to be nice.
3.if they are not working, I have not noticed a flirt; and we have very little in common, I will find the quickest way out of the conversation politely.
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Smile less, Your fangs are showing...