We already do this with some slurs, right? We can start enforcing these words, too.
Not calling anyone out, I’ve been guilty of it too. And we don’t have to do it all at once. Like, we can start with these:
Ableist words and alternatives.
Stupid, R€tarded, Idiot(ic), Cretin, or Moron(ic): People say this to imply something, or someone isn't intelligent or worth their time, but the words refer to people with intellectual disabilities. Instead, say that a situation or person is frustrating, ignorant, dense, unpleasant, cheesy, or awful.
Dumb: This word refers to a person who doesn't speak verbally, but people often use it to mean that something or someone isn't intelligent or wise. It's listed separately from stupid and its synonyms because it references a physical disability instead of an intellectual one. Try using any of the non-ableist synonyms like irritating or uncool.
Crazy, Nuts, Mad, Psycho, or Insane: "Wow, that's crazy!" may not seem like a harmful statement, but if you think about someone with a mental health condition hearing that statement, it's easy to realize that it is. So instead of using one of those words, try outrageous, bananas, bizarre, amazing, intense, extreme, overwhelming, or wild.
That literally means the exact same thing. It could just as easily be on the first list. I think this is a great example of how dumb this stuff gets. Language evolves, and even words which have roots in ableism can be completely divorced from that connotation. No one thinks that when you say something is "stupid" or "insane" that you are in any way referencing people with any kind of mental condition. Because you're not.