My take also.
A gentleman never refuses a womans hand, no matter how despicable and disgusting she is.
A gentleman never refuses a LADIES hand. She's no lady.
A gentleman would have already been impeached by the likes of your woman. Trump’s hand was holding all the Aces, duces, wild cards, and Trump cards thus he wasn’t going to fold and let her empty hand win.
Manners has its limits. Nothing is mandatory.