Thing is that’s how slurs are born isn’t it? All slurs started as descriptive words for groups of people but when enough people use them with disdain or malice for long enough, suddenly the word becomes irredeemable and it can no longer be said without having all that hate automatically added on intentional or not.
Even the n word would have started out as a regional term simply for black people (hear me out). If you look at the word or the way it’s pronounced it’s really just a mangled or incorrectly pronounced version of the word negro which is simply the Spanish/latin word for the colour black. But because of the people that said it, in the way that they said it, in the region they said it, at the time that they said it, it can no longer be said lest you be magically transported back to the 1800’s with a whip in your hands.
So even though cisgender is not currently a slur, if it continues to follow the path of all slurs before it, one day it will be
Thing is most likely you wouldn’t be in an afterlife or be able to see anything or anyone, you would just cease to exist and you would be doing just as much experiencing and thinking as you did before you were born. So being remembered is a way of extending your existence by living in the minds of those you impacted in your life and knowing you made a difference, that it was worth you being born.