OP, as we can see there are just some inherently selfish people when it comes to this subject, and more than likely indicative of the way they live the rest of their lives, sadly for them. I’m also sure they would be the type, when confronted, wouldn’t refrain from anti social behaviour.
Having said that, I personally wouldn’t confront anyone in case they had a hidden disability. Although, as I’ve noted very recently
some people may even suddenly develop this when confronted.