Wow, it’s wild that you think you have a right to the attention of strangers with whom you have no business. How is it rude to wish to go about one’s day unbothered?
I think if you are in public, you can't expect to be in private. You can try, but it obviously doesn't always work and we are exposed to all types when out of the house.
Seems like a tragedy of the commons. People don't have a right to your attention necessarily, but you also don't have the right to be unbothered arbitrarily.