“Cis” (short for “cisgender“) is a term the trans cult fabricated to describe people who are not trans (most of us). History has shown that it is not wise to let a group of people define you against your will and without your consent. Since none of us consented to this forced labeling, we should reject it whenever it appears so we are not letting our enemies control language.
“Cis” does nothing for us while allowing them to group us into a target group for bigotry and harassment.
It is also so mundane and unimportant a notion that it doesn’t really need its own word. It CERTAINLY doesn’t deserve to be the one word that gets to monopolize the prefix cis- by abbreviation.