Met Michael Portillo and can tell you that he is as charming and polite in real life as he is on his TV appearances.I think it is due to being extremely happy with what he does for a living ( train programmes). Getting back to OP, my DF always judged a man on the state of his shoes and of his hands. Couldn't abide mucky hands, ragged nails. I don't think holding doors open is just a gentleman thing, I do it too, it is called good manners and should be practised by and accepted by both women and men without any snarky comments about sexism. Being a gentleman to me is about being well groomed, polite, and respectful of other people's opinions and beliefs, no sneering, no shouting ( so that's you out, Boris Johnson, you are an oaf, albeit a well spoken and expensively educated one). Class and/or money are not indicators of whether or not a man is a gentleman ( see comments re Boris).