Honestly, this is such a dumb argument. The creators of The GIMP acknowledge that this is a reference to a BDSM kink popularized by Pulp Fiction. Leather bondage masks are probably the first thing most people think of when they hear the word "Gimp".

Yes, it is also a relatively obscure ableist term for someone with a visible physical disability, but this was never what the creators had in mind with the name. Pretty much nobody uses this term anymore.

Just let it be. If you oppose it for being ableist you're just pretending that the name is a reference to something offensive, when it's a well understood fact that it wasn't named after the ableist term. If you oppose it for what the creators named it after, you're basically just kink shaming, and I really don't care if the program is a reference to bondage sex.

Surprisingly people don't constantly rally against LAME, the MP3 media encoder, and liblame is a massively important library for audio processing used by just about every computer in existence. This was deliberately named after the ableist term, and the 'L' in "LAME" stands for "LAME", so they could have used literal any -AME name they wanted, and kept their stupid recursive abbreviation + ironic project name that was so popular at the time (LAME stands for "LAME Ain't an MP3 Encoder").