To further kick the tangent can down the road in regards to CIS.
I think it's the second most lame pejorative term I've come across in the last few years. The worst is still breeder.
Take cunt for example. It's a word I've never used outside this thread. As a curse word it is concise, conjuring up guttural imagery with an onomatopoeic (is this the right word?) oomf in the unt and the harsh inflection of the C/K sound, (probably explaining its wide use in England) and the popularity of "Fuck".
It has all manner of awful connotations. As a 'Bad' word it serves its purpose.
Now lets look at Breeder.
Straight off the bat we have a whiny ringing E sound, and awkward R inflections. What images does it create? A horse rancher?
Even taken in the literal sense it's a grim and depressing look at homosexuality, in fact its almost shooting oneself in the foot to use it: while having children is an option for most heterosexual couples, in a lot of countries for homosexual couples it is not, Its antonym would be something like "barren".
Thats why I think the word breeder is the shittiest swear word to use.
So lets come Back to CIS, CIS men and the like
Even in genuine use CIS is inflexible, has no musical ring to it and for the mundane ignorant masses such as myself meaningless. As a gender descriptor its ugly, Homo has the lovely repetition of the O's, hetro snaps back on the tongue, lesbian and so on are sexy sounding words, they literally evoke images of sexuality.
As a pejorative it was even less accessible, it was obscure. Googling it led me to the feminist equivalent of bible beaters who assume everyone other then them is going to hell.