A woman I worked with long ago was trying to tell her boss that something was "a whole new ballgame" but came out with "whole new ballpark." The boss didn't pick up on it, but after work she mentioned it to her husband, and "a whole new ballroom" became a family catchphrase.
There's actually a subreddit for these terms... can't remember atm.
That's how those sorts of phrases work in German too.
“I have autism” is a better statement than “I’m autistic” because autism doesn’t define me.
If that sort of thing is useful for you, go for it, but I'm also leery of these attempts to redefine language when they involve larger campaigns. Most people don't consider "I'm X" to define them when it comes to other concepts and honestly it seems like it could be helpful to consider such things are part of your identity. I'm black/autistic/diabetic/etc puts in a larger community. It doesn't define who you are overall, but does give you some sense that one of your attributes is shared with others.