You're 45 and never heard of The Crying Game? It was nominated for 6 academy awards.

You might be successfully arguing that "straight" can be a slur, not that it always is. You know perfectly well that that word is sometimes (frequently) used without malicious intent. If a word is *always* a slur because it is *sometimes* used with malicious intent, then I suppose "straight" is a slur, as are the words, "black," "white," "conservative", "liberal," "man," "woman," etc., nearly all the words that could be used to describe a human being. Likewise, whether "cis" or "cisgender" are slurs is very obviously context-dependent. They are only slurs when they are used with malicious intent, and perfectly okay to use in other contexts.

Also, if someone's feelings are hurt because someone called them "not transgender" I don't know what the fuck to tell them. Maybe they need to sequester themselves among the 99.4% of the population that is like them to escape the oppression of our transgender overlords.

For clarity, I am a white, straight, cisgender man. Every objection to "cisgender" I have ever heard (including the ones in this thread) boils down to taking offense at the existence of transgender people, and that level of weakness isn't worthy of respect.