Earthborn
Terrestrial Intelligence
It is always a good idea to try to avoid offending anyone, and also to try to avoid being easily offended.They can keep their insulting terminology out of common discourse then. Many people find it useful to refer to males as "he", but somehow that's not allowed because it might offend someone. But in other contexts it's allowed to use words that offend people? How does that work?
IMO People should try to infer whether a person intends to insult rather than focus on the specific words used. If someone refers to a transwoman as "he" because they didn't know she was a transwoman, or didn't know transwomen generally prefer to be referred to as "she" than that is at most a social faux pas. Someone who refers to a transwoman as "he" despite knowing it causes offense, that is clearly an insult and potentially harassment.
I've certainly heard terms as "ciswoman" and "cis" used in ways that were clearly meant to insult. I don't think the terms are inherently insulting; I see it more like attempts by racists to use politically correct words such as "African American" in intentionally sarcastic ways.
Of course some words have such a overwhelmingly negative connotation that they are better avoided entirely because there are practically no situations in which they can be used inoffensively. If you think some words fall into this category, ask the mods to add them to the autocensor and report the people who use them.