X now considers the term “cisgender” a slur. On Tuesday, the platform reportedly began posting an official warning that the LGBTQ-inclusive terms could result in a ban from the platform.
By "post" do you mean the comment I replied to or the actual OP? Because I believe that the intent behind classifying "cis" as an insult is more aligned with my interpretation.
If using the word "cisgender" is a ban-worthy offense, it's not being considered "a word that can sometimes be insulting", it's being considered "a word that is inherently harmful to use in almost any situation"
I don't think that terms that can get you banned would do so in any context. You'd have to use it and then someone else would have to report you. Might be wrong though.