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From wikipedia: https://en.m.wikipedia.org/wiki/Cisgender

The term cisgender was coined in 1994 as an antonym to transgender, and entered into dictionaries starting in 2015 as a result of changes in social discourse about gender.[4][5] The term has been and continues to be controversial and subject to critique.

I think there's some confirmation bias on your end here. The local community (including me) tends to be young and liberal and knows the term cisgender. I'd bet that the majority (by a huge margin) of English speakers (including as a second or third language) has never even heard the term cisgender or doesn't know what it means. Lots of them will react negatively if you label them cisgender out of pure ignorance and false assumptions - no transphobia needed.

Only complete asshole transphobes do. Honestly, not even they do. They just lie about it as a gotcha.

Sure, they exist. But what's their percentage of the population or the X user base? I think you're making a false generalization by an invalid extrapolation.

And just to be clear: I'm not saying cisgender is a slur. I'm just pointing out that the notion that community A or an individual can decide whether some word is a slur or not in community B is ridiculous, and that the argument, from the first comment I replied to, for technical correctness or intended meaning of a word is irrelevant for who considers what a slur.

I hope that made my point clearer to your dry-nosed primate's brain.