"Oh, stewardess! I speak jive" would absolutely get you cancelled today. I don't think it's mean-spirited either but that's not enough to save you these days.
When I watched it recently the joke that kinda flops is the heavily stereotyped gay man. Whether it is offensive I have no idea. Its not flattering.
Sure, the old white woman using heavy black slang is where the joke comes in.
I don't get it does that make her a racist or something? She tries to help.
The joke is: their slang is so heavy its another language.
Personally make fun of zoomers all the time for this.