There are many ways to show them the disrespect that they deserve. For instance, the gal that was on that train is obese. The white guy could have commented she would not need so much space if she were not so fat. Or one could respond: “I am sorry you are so easily offended.” Or “you are a white hating idiot.”
He probably started out polite, realized she wasn't hearing him, so he did what a normal person would do, moves her $hit so he could sit down.
No racism here, just an entitled fat pig of a person who thinks they have the "right" to take up two seats.
Any other color or person would realize that oops, didn't hear you, sorry, I'll move my stuff.