Three examples:
**What’s Opera, Doc?*– Voted the Best Cartoon Ever in 1994, this short condenses Wagner’s Ring Cycle into a 6 minute short, starring Elmur Fudd as Siegfried and Bugs Bunny as Brünhilde. Bugs is dressed as a valkyrie for (almost) the entire episode, and no one reacted
*iCarly– In one episode, Carly, Sam and Freddie ask their in-universe viewers for videos of them dancing to show the best ones on their in-universe show. They watch them well into the night, and we see their dance-related dreams. Carly’s has her in a dress in the apartment, with several identical men dancing with her. At the end of the episode, Spencer, her brother, takes a now-sleeping Carly up to her room, then goes back down and falls asleep where she was. As a quick joke at the end of the episode, it has Carly’s dream start again, but with Spencer in her place. Yes, in a dress and dancing with the identical men. Not meant to push an agenda (I don’t think, anyway). Just a brief little gag with him winding up in his sister’s place in a dream.
*Kim Possible– In one episode, Drakken makes a machine that makes people switch bodies. Notably, Kim and Ron. For the most part, the episode is similar to the movie Freaky Friday. They have to survive a day as each other. Which is worse for Ron, because of Kim’s “I can do anything”-themed schedule. The closest it ever gets to an agenda, in my opinion, is when Ron makes a throwaway comment about how he did kinda like the skirt.