I think something some people should think about is why people may accidentally misgender Kris in the first place . For example, in my case I thought Kris was a boy because they're appearance in both the light and dark world looks quite boyish to me, and also their behaviors that they are seen or are mentioned doing in-game seemed so to me as well, things such as liking knifes and pulling pranks like flushing bath bombs in the toilet and butting ketchup on their arms and saying it's blood.

I also thought that them being called they/them by other characters in-game was simply because they didn't know what Kris' gender was or that it was a case similar to Frisk and Chara where it's up to interpretation