It's all part of the "magic" of Disney. There are a LOT of folks there who are part-time users; many never need a mobility device except during their trips to WDW. So to them, a CM calling their rental
ECV a "chariot" or a "land speeder" is kinda funny, and all part of the Disney bubble. In 50+ years of regular attendance at WDW, I have never seen or heard a CM call anyone's mobility device (or stroller, for that matter) anything that could be construed as intentionally offensive or mean.
To those of us who are full-time permanent mobility device users, it can be a bit less... charming, unless you are ready to play along with the CMs. Most of my family is autistic, so they are mortified at the idea of "participation" at WDW, but I enjoy it whenever the opportunity presents itself. I am always there to act my shoe size, and not my age!
Probably what bothers me most is when I get this from another Guest (usually with a certain amount of snark) "Must be *nice* to be able to sit down..." Yeah, no, it's not. I would literally trade everything I own to be able to walk independently again, and to never have to use a mobility device again. But sure, I drive this stupidly expensive chair because I'm too lazy to be bothered to walk...
Personally, I don't mind being called "friend"; we noticed that Disney started using "Friend" during the pandemic when CMs were trying to remind folks to keep their masks on. So, I'm guessing that "Hey friend, please keep your mask on" just sounded... more friendly than "Yo, dude pull up that mask!"