If a girl shows interest, I would reply with "Woah, not now, my time is valuable." and then engage them afterwards obviously to show that I'm joking. But, do these jokes actually show you're not afraid to shit on the girl? Or does it come off as annoying and trying too hard to get a reaction?

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I honestly can't tell if she laughs out of shame or because she genuinely finds it funny. I do it because I genuinely think it's funny as a joke and because I don't like being serious and respectful all the time.