midge I'm not entirely sure I understand? I use 'cis' and list my pronouns on certain anonymous social media sites, because I don't like being misgendered (it's not triggering or upsetting, it's just not something I like). I do this because while my full name is an obviously female name, the shortened form I use could be used for someone of any gender.
Sometimes people see my shortened name and assume I am male, it's fine, we laugh about it and move on. I choose to present in a reasonably feminine way, if I didn't do that I'd probably make it clearer I was female (either by using my full name more or just telling people) because again I don't like being misgendered.
I, personally, use 'cis' more when talking about something in which me being cis is relevant, so in a discussion around trans issues or talking about periods or pregnancy etc...
As a cis woman I have different lived experiences to a trans person, and sometimes my experiences are more central to a debate and sometimes I need to take a step back and listen more to someone who's experiences are more central.
Also, sometimes I mess up, or say things wrong, and it's important to qualify my statements with "I am cis, so this might be wrong, but this is how I see the issue"