For me... being hit on is mostly having someone begin the conversation in a way that indicates they want more than just a "hello". I dont mind that as I find it a compliment to my endeavors en femme. So long as the person in question can take "no thank you" for an answer gracefully and walk away, then everything is good.
At renaissance faires there is something known of as the infamous "Kiss Card" and I have to shun about 30-40 of them a day depending on the faire. if someone doesnt mind the cheek kiss, then I'm good with that, but otherwise I politely decline. All in all it is still a major compliment to be asked.
*hugs*
Zarabeth