Yeah, it seems like he didn't want to get into an argument with her.
According to the OP he was "muttering complaints" as he walked into the train.
It doesn't sound like he was complaining to her specifically or any particular person, just in general complaining about all the people not moving inside.
But she heard his mutterings (knowing it was about her and her people) and decided to confront him and film it to post online.
They got into a heated argument at that point.
Honestly, I don't think this guy did anything wrong whatsoever.