Maybe it is just me, but I find this made up word to just be silly. No offense to the transgender community, but the trans community are the ones who decided they wanted to be called "Trans". Gay groups decided to be called "Gay". Other groups used to call them other, mostly derogatory, names and they decided for themselves how to be referenced.
I don't know of any CIS community and can't remember it's members ever being asked about, or deciding on, being called that. Can anyone think of one other common term that Cis is used as a prefix for? I'm sure there may be some obscure words out there, but most people have never heard this term so the use of CIS as a prefix is meaningless.
How is arbitrarily labeling people cis or cisgender any different than a straight guy calling someone a fag? Or white people calling a black person the 'N' word? One group has no business labeling another.
I'm sorry if I offend the PC police, but I am NOT a "cisgender" male, I am perfectly fine as just a human male thank you very much.