it appears due to simple unfamiliarity the first time
I may have something nice to say.
The second time, point out firmly but calmly that pointing a weapon at someone is often considered a direct threat to life.
The third time is a charm. I've found an elixir that leaves an indelible impression and stops future violations cold.
It is whatever that stuff is that leaves a black .45 caliber ring on the tip of their nose once I have screwed my 1911 on it.