I think a gentleman is someone who holds the comfort of other people above their own. The instinct to do that is inside every good man, I believe. The rules about opening doors and buying dinner and all of that other 'gentleman' stuff is a chess game, especially these days.
Then it was that the exports of slaves from Virginia and the Carolinas was so great that the population of those States remained almost, if not quite stationary.
No feature of the Obama presidency has been sadder than its constant efforts to divide us, to curry favor with some Americans by castigating others.