I just reviewed "The Show-Off" which has a similar - Irish vs. WASP thing going. In Passion Flower it is a bit more subtle, but Kay Francis is still most definitely the other - liberal, louche, a free-thinker.
In reading the other reviews, I note the historical value mentioned about the depression. This movie scores an 8 for me because of the priceless line about the battle of the sexes.
And of course it is Zazu delivering it - I think someone should gather her speaking roles in all her bit parts and string 'em together, end-to-end.
As I recall (I saw the move several years ago, but believe I watched this scene several times, I was so wowed by it), Zazu is mopping the floor and chatting "men trouble" with Kay Johnson. "I don't know about men," says Zazu. "They can be handy during the day and entertaining at night, but that's about it. I don't know about men." HANDY DURING THE DAY and ENTERTAINTING AT NIGHT? Now don't that just sum up the plight of 21st century manhood? And Zazu figured it out in 1930! Evewryone should watch this movie for that one scene. It is one of the best.