What if this woman on the train was laughing about a mean Polish joke a friend just sent? https://www.youtube.com/watch?v=pER3fa_mTo8
Political correctness has a few incarnations. What is normally thought of a PC culture but also, I think a childish and irrational desire to be free of social consequence. The idea that humor calculated to offend should somehow not offend is pretty stupid. Don’t conflate freedom with insulation.