Please excuse my ignorance, I am 22 and I went to an all girls school and have led quite a sheltered life so I don't really know what flirting is unless someone is very explicit and over the top.
I'm on a university course with men now and I get along with them well. The thing is I don't really know what flirting is. We are all young adults. One guy keeps kicking me under the table and we make fun of eachother all of the time and laugh. There is another guy and I joked that I didn't want to sit with him and that other people wouldn't want to go near him and he said the same and I said 'oh but I thought we were best friends' and we joked. That's just regular teasing amongst friends isn't it? I really don't know what's classed as 'banter' and teasing or flirting.