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.
I mostly get takeout, I have to admit - I don't know if that's something to be ashamed of. I'm not much of a cook.
If you learn one thing from having lived through decades of changing views, it is that all predictions are necessarily false.