How to antagonise a certain older relative, suggestion #47: mock people of the past for nasty attitudes about certain other of their contemporaries, attitudes we should apparently forgive and treat with respect because back then everybody (except for the marginalised group itself, and sometimes even they) did it.
Today’s examples, courtesy of Retronaut: Vintage ad sexism and Tips for Single Women, 1938. (Follow the links for the images.)
“Don’t be familiar with your escort by caressing him in public. Any open show of affection is in bad taste, usually embarrasses or humiliates him.”
EWWW! Affection from a woman! How HUMILIATING!
Moved On 
Jeremy’s got girl cooties!
(ooh, interesting transfer of affection to scatology; wonder what that’s about)
It’s interesting that the embarrassment caused by such womanish licence happens because of the man’s obligation to his peers to be a goodly manly statue instead of anything human. So his submission forces hers, and so it goes…