Interesting - I wonder if that changed over time? In the two films I mentioned it's used sincerely. Cary Grant says, "Gee, that's mighty white of Mr. Peabody" after learning he may donate a million dollars to the museum. And in MAMC, William Demerest pumps the justice of the peace's hand and says, "That's mighty white…

Oh, and what about, “Mighty white of you”? It comes up in two of my favorite films: Preston Sturges’ Miracle at Morgan’s Creek and Howard Hawks’ Bringing Up Baby. I’m sure there are plenty more.

Zoot. The muppet's name is Zoot.

Hoping you put “sex positive” in quotes because anyone who behaves as you describe is absolutely not. Being "sex positive" is about consent, communication, openness, avoidance of shaming and mutual satisfaction.