I was training in the gym and outside there were people passing who looked inside. I looked at them curiously and was surprised how many they were. They were a few guys and many girls. One guy among them aped me doing my moves and the girls laughed, while looking at me. As if the girls wanted to see how I reacted. I looked to the sky behind them, pretending it didn't phase me. But it did.

I was wondering why he dared to do that in the first place.

Don't tell me it shouldn't phase me or suggest meditation, which goes the same route. Share how I could react in a way that makes a guy like this think twice next time.