The man triggered the transgender by mistake. It is impossible to use a language that never ever triggers someone.
But of course, there are others that trigger on purpose. When they do, they play the same game of power over others than the 0.01%, on a much lower level.
How do we want to treat them? If we call our big brother who puts them into prison, we will play this power game forever...
If we want it to stop, we have to stop first.