Not really sure on this one:
My stop on the way to work has an escalator that can go either up or down. If there's nobody on it, it stops, and whichever platform - top or bottom - is first stepped on decides the direction the escalator goes. Now, it's not a particularly long escalator, but it's the only way for people unable to use the stairs next to it to reach their train, as the elevator to the train platform is on the other side of a busy street. I usually take the stairs, but if I'm very tired or carrying a lot with me, I take the escalator. However, I make a point to look up and see if anybody needs it to get to the bottom level, and if I see someone, I alert those behind me to it, too.
Today was one of the tired days, particularly because I'd had to walk up a very long and steep defective escalator just before the bidirectional one, so seeing nobody at the top platform waiting, I stepped on the escalator (along with a bunch of other people).
However, when I was halfway up, we were all severely berated by an elderly woman with crutches who stood a fair bit away from the exit so it was impossible to see her from below. She proceeded to call us all lazy and selfish and when I told her she needed to step forward a bit so people on the bottom level could see her, she focussed her tirade directly on me.
I'm not sure she really counts as a special snowflake, she was probably frustrated and maybe in pain, but I had phrased my advice very politely and emphatically and her tone was just hostile. I considered alerting people approaching the escalator on her behalf, but her behavior made me think twice. She shouted down herself, then, anyway.