If you live in a closed state primary like Florida, you do have to join to vote in the primaries of your party.

I don’t think that’s what actually happened. I think people just used it as an excuse. I think it amounts to people not wanting to admit they are <racist, misogynist, Nazi, homophobic, etc> and are looking for an excuse, any excuse, to vote for their secret interests. “Oh I would have voted for Harris, but… She laughed this one time… And really, Trump just feels like a better use of my vote now.”