I did like Shatner. But I am more of a Jean Luc fan to be fair.
However, I think I love William Shatner now!! He has nailed it indeed.
My issue with cis is that it means ‘non-trans’ while hetero actually has a real purpose in positively describing attraction. And historic application of being used as well. Hetero does not mean ‘not gay’.
Therefore, does ‘cis’ have use at all for humans outside of academia? For example to use another dysmorphia. Do we call people without anorexia ‘non-anorexic’ people?
And frankly, this belief in having a gender is truly like having a religion. While technically you can go around and say people might be Christian or non-Christian, saying that centres Christianity in that discussion. Is that being ‘kind’?
Like Shatner, I have come to the believe the term is used negatively to harass. If you want to pin that label on yourself, go for it. If you are talking to people in real life, and you refer to them in that way and you don’t know them, then it is not appropriate.
I know very few people in real life who believe they have a gender identity at all and who would think cis applies to them.