There’s a clear campaign against the mentally ill with the global rise of fascism. Lots of it shows up in anti homeless rhetoric, but you can see it in the MAHA and anti vaccination movements.
There’s no reason to use the word “r-tarded” to describe someone. As someone who’s worked with the intellectually challenged, it’s an insult to them to compare them with people who are willfully ignorant.
I think it’s more about the idea that it’s shameful to be less able than someone else. The core idea here is that there’s nothing wrong with being less intelligent than average, and calling out people’s choice of words is only one part of that.
It’s like when people make fun of Trump’s weight/diet or RFK Jr.'s voice. I dislike those two just as much as the next person, but there’s nothing immoral or shameful about having a vocal condition, being overweight, or having a monotonous diet. And any health concerns (e.g. weight) should be left between a person and their doctor.
If you choose to make those things a subject of your ridicule, all it does is mark you as a shallow person, and I’m probably going to tune you out as someone who doesn’t have anything of substance to say.
That argument isn’t specific to any particular word though. You could say it about any word that insults intelligence, not just the one in question here.
That’s a great point, but I don’t see how that would justify using this specific word.