Earlier quoted context omitted.
I definitely recognize this process (and have heard the term euphemism treadmill from McWhorter the other commenter pointed out) but since when has "disabled" been used as a slur? I'm sure it's happened, but I'm not sure I've ever heard of someone using disabled in a derogatory manner like you would hear "retarded" commonly used now.
I get the sense that "disabled" is still in its avant-garde phase. "retarded" passed that in my circles maybe a few years ago, but also there was a time where it was much like "disabled" is today. Aside, somehow "retarded" got replaced by "special needs" or "short bus" in some circles which also sounds insulting to me, so maybe we'll continue this treadmill for awhile longer.
I could go with the first two in a code review.