BigMal: Out of interest does anyone here play with the hair of waitresses in cafes? I can't think of an appropriate time to do it, I don't even consider it playful. When would playing with a waitresses hair ever be considered playful? It's definitely weird. He probably shouldn't lose his job but he should probably see a psychiatrist or something.
I dunno, depends how well you know them to a small degree and I think it's definitely more acceptable in men of JK's generation to horse around in that fashion. I probably wouldn't do it, and I certainly wouldn't do it if I detected any hint of uncomfortableness. It's not acceptable in today's society, but I know plenty of people who think that is PC nonsense.
I personally fall a little in the middle where I think intent, and perception by the recipient are factors.