No One Actually Believes That Cis Is A Slur, Here’s Why They Pretend To — Katy Montgomerie
No One Actually Believes That Cis Is A Slur, Here’s Why They Pretend To — Katy Montgomerie

No One Actually Believes That Cis Is A Slur, Here’s Why They Pretend To — Katy Montgomerie

People feel that "cis" is a slur because it puts them on equal footing with trans people.
They prefer to consider themselves "normal" while "trans" people the weird ones whom can only be labelled with anything other than "normal." Being called "cis" makes them feel as if they can also be labelled as something other than "normal."
Similarly, one cannot be "straight" without acknowledging existence of same-sex attraction, so people uncomfortable with that won't describe themselves and expect everyone to assume they're "normal". These people don't teach kids to say "they are straight", they prevent them from obtaining any knowledge about human sexuality at all to avoid even the possibility of admitting "exceptions" exist
To be fair, "cis" comes from latin which means "on the same side of," in contrast to "trans" which means "on the other side of."
Why use that instead of non-trans? I don't know, but yeah, I don't think the word is a slur.
Non-trans is still othering to trans people in its own way (there's trans people, and then there's everyone else). It's also kind of imprecise and awkward. To use the analogy from the comments above, it would be weird to describe someone as "non-black" or "non-blonde-haired person" etc.
Cis is a term that allows for better discussion and examination of intersectional issues. You could, for instance, compare the experiences of black women who are cis and gay, and black women who are trans and gay and figure how those two specific groups might face different unique systemic challenges. Once you tease apart novel issues at that level, you can better address them.
The right always is trying to muddy that puddle because they hate the clarity it provides, and they percieve the examination of the issues as a threat to the heirarchies from which they benefit. Same reason they have tried to turn CRT into some kind of toxic term, or why they came up with "All Lives Matter".
English loves antonyms.