I'm a bit conflicted about this.
Q10: What if I believe it is grammatically incorrect to use some pronouns (e.g. they/them to refer to a single person)?
If they are the pronouns stated by the individual, you must respect that and use them. Grammar concerns do not override a person’s right to self identify.
We also have freedom of expression, one of the fundamental human rights, which gives you right to express yourself freely. Exceptions are when there is conflict with law or other basic rights.
But the way I see it, is that even if I misgender/"mispronoun" you accidentally (or even on purpose), it does not conflict with any law or your right to self identify.
Your identity is not determined how others speak, you have the authority to determine it and my misplaced words won't identify you.
In my opinion, forcing me to speak in certain way violates my right of expression.
Also, as a sidenote: comments are only meant to suggest improvements or ask clarifications to questions/answers. If people start discussing about pronouns in comments, that would violate the site rules.