Have you ever used vagularities at somebody in public before?

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I think I lack of confidence and afraid to speak out in public. I don't like the sound of vagularities especially in Hokkien dialect. To be honest, I cursed before, but only when I am really angry and it boils over my tolerance level. Other than that, the percentage of me swearing at someone is near to 0.1. I have yet to shout out loud in public, and I don't wish to do so. I have hear others done so before, youngsters, even my mum do that too when she is really mad. I hear people say vagularities in Cantonese is rather pleasant to the ear... My lecturer mentioned that if you offend someone in Hong Kong, and you hear a string of words thrown at you but you don't understand yet it sounds nice, you most probably have been cursed and swear at till even somehow it's your mother's business or something. So have you swear at someone before? Especially in public?