The pamphlet is all about what you are ranting about
Maybe you should not be beating that drum about ranting quite so much.
...that one persons enjoyment of their elf game and their feelings about it trumps everyone else's at the table. There are humans sitting next to them, but their feelings come first.
I have to ask - though, from what you write I am not sure you would know the answer - have you ever witnessed someone who has been diagnosed with PTSD by a mental health professional have a panic attack from being triggered*? Or been in the room when the related night terrors wake them screaming?
Because, if you had seen that, I don't think you would question this - In fact, yes, there's times in your hobby entertainment when one person trumps the others. Avoiding that trauma is worth a bit of the enjoyment of a handful of other people. Similarly, helping some abuse survivors avoid the images of their abuse is worth a bit of edginess at some tables.
Among ethical, basically good people, this should not be a question. If someone came to the game with a broken leg, folks would shift their chairs a little bit to make room for their cast. If someone comes with an honest issue with some content, folks should be willing to do the metaphorical same, and shift the content a bit to avoid the problematic bits, and have folks concentrate on the rest for their fun.
If we all agree to that, then we are only left with quibbling over the particulars of how, which should not be worthy of the acrimony seen here. Since we have the acrimony, it follows that the thread overall
is not just about those particulars - and you should probably stop holding folks to discussion as if it were if you want it to be constructive.
*In the common parlance, the word "triggered" has been somewhat over-used and diluted. It does not originally refer to "exposure to something mildly upsetting". It is a serious event.