It's a tough line to define. On one hand, we don't want people self-defining words, as that doesn't facilitate good communication. On the other hand, language changes as society changes. In the 1800's, there were only two gender identities: gay and straight. Today it's not that simple. Even you parse out bisexual into at least three different terms, two of which are recently fabricated words. The last politically correct indoctrination seminar I attended defined queer as one who is not cis-gender, hetero-normative, binary, monogamous and one other classification which I've forgotten.
The meaning of terms change all the time. Sex (as an adjective) and gender used to mean the same thing. Now they describe very different aspects of a person's identity.
It always bothers me when someone says "that impacted me." I learned that phrase meant either they were hit by it or it caused them to be constipated. But recently I did look it up in a mainstream dictionary and it now it's considered a synonym for "affected." Personally, I continue to use it in the more conventional way.
"Verbizing" a noun (that's an example of it there) also violates conventional grammer, but who doesn't say "I googled it?" I'm sure you're familiar with the expression "the pt has been heparinized;" bugs the heck out of me, but it's accepted. While the expression "Jewing someone down" is derogatory, its use is unfortunately common enough that people understand what it means. These examples are all wrong, but at what point of general acceptance does something which was wrong become right?
While I'm more conventional in my use of words, I do agree with not using the expression "non-straight." It sets straight as the standard by which other are compared. It's like saying someone is non-White. With the majority of the world being people of color, it seems a bit obnoxious to use white as the standard.
For a really foolish example of political correctness and speech codes, read about why we should never call a woman a female lol https://lawprofessors.typepad.com/gender_law/2017/11/why-you-should-stop-using-the-word-female-.html