See? Look how easily offended you are when an an internet random says cis is silly. I have no qualms with calling you cis but I don't actually envisage a situation irl where i would ever need to use that as a descriptor.
Example 1: I'm a first aider. If a cis woman went into cardiac arrest and I had to administer CPR, I'm pretty certain when the emergency services had been called, I would just describe the patient as a 'female, in cardiac arrest, unresponsive, etc'. Wouldnt enter my head to stick cis in there.
Example 2: If I saw a man mugging a woman on the street and had to report it to the police I would say "male, aged approx mid 30s/40, etc etc". Again no need for the word cis.
Example 3: meeting a lovely person and discussing with a friend. "Oh I met X yesterday, what a lovely woman she is, blah blah blah"
I just cannot envisage when I would ever use the term.... seems kind of redundant. If you want to label yourself crack on, but to me, if you looked like a woman and I had no idea of your labelling preferences, I would describe you as a woman if it came up in conversation generally.