It happens a lot to me......I am very friendly and some people take it as being flirty.
I was friends with someone that accused me of being flirty with a young lady. Young enough to be my daughter. I was so offended that I cut off our friendship. I will not be accused, nor allow anyone to accuse me of being a flirt. If I think you're cute, I'll tell you, Hey, you're really cute. If you look nice I'll say...hey, you look nice. If I think otherwise, I don't say anything. I like being friendly and meeting people.....am I a flirt? If you try to put the move(s) on me you will find out.