Isn't this made-up word describing like 99% of the population? Transgenders make up all of 0.3% of the American population.
Ive seen cis thrown around by imbeciles on Twitter. When I come across it, I make a point of replying that there was no point in creating a new word to use as substitution for an already perfect word. I will continue to use, normal instead of adopting the silly, made-up non-word, cis.