Until it happens to you, it's hard to appreciate how infuriating it can be when someone treats you to their unsolicited moral judgments of you when you're just trying to go about your day.
I experienced this last year while grabbing some breakfast with my family at a time where I happened to be wearing a New Pornographers shirt. For those unfamiliar with the band, their name is the closest they get to being offensive.
Nonetheless, some self-proclaimed spiritual leader proceeded to tell me how much he didn't approve of my shirt and how Christian I need to be in his estimation. I'm not sure I've ever struggled for a way to politely tell someone to go away as hard as I did that day.
But as one woman's experience with an American Airlines flight demonstrates, something as inconsequential as a shirt doesn't just run afoul of random street preachers, but potentially the policies of entire airlines.