Wait until they realize that every single fucking insult in existence is equally "able-ist", by definition, or otherwise offensive in some way. Is the expectation that we slowly disallow insults in culture? No, it's going to be arbitrary whitelisting. Stupid (there I go being ableist).
A change like this doesn't work as intended without fundamentally changing the narrative. If a character was insulting someone, they should still be insulting someone. Want the story to be different? Write a different fucking book.