I completely accept that gender is imposed, and that usually trans people simply switch gender rather than reject it, although I was including non-binary people under the trans umbrella.
But as a taxonomical term, is it fair to label someone cis if their gender performance is easily identifiable with their biological sex, and they do not experience gender dysphoria, even if it is a label they reject? I've conceded there are some people who fall between the cis/trans camps, I'd suggest
weepiper might be one, but a lot of people who reject the cis label have not actually rejected their assigned gender - they are still visibly the gender they were assigned due to their biological sex.
And I'm only really interested in it as a taxonomical term. I recognise it is often used in an ideological way, and often pejoratively, much like white, black, het and other taxonomical descriptors, but I'm not sure that means it shouldn't exist. I've used cis and non-trans interchangeably on this thread, but 'cis' feels better as a word and I suspect that any term would end up being attacked - and spat as a weapon by the more annoying trans supporters. But there has to be a term, it's impossible to really examine transgenderism without a word that means not transgender.