Wdym
That's just one of those people who are dumb to the point in which they seem to not know that the term cis is an old term describing exactly what they are because he didn't look it up.
https://www.merriam-webster.com/wordplay/cisgender-meaning#:~:text=Cisgender%20(also%20styled%20as%20cisgendered,girl!%20or%20It%27s%20a%20boy! it has been a term for you are what you were born as since before you were born.
