i would imagine it's the middle-aged and older volunteers who are struggling to come to terms with the change in language. having spent some time growing up and ingesting media like youtube which is full of references to terms like cisgender, it leaves the youth in an easier position. this is their lingo.
it's quite an interesting exercise to think on the run, as you talk to someone or a group of people, to try to remove any gendered terms from what you're about to say. which is occasionally something i need to do at my place of employment.
that said, the moral high ground is a fairly small and precarious patch of turf. you only have to peruse any number of reddit threads to see pro-lgbtqi+ rights people arguing over whether or not someone is using the correct definition, or what that definition means, which is an odd position to take given gender has become inextricably tied to individuality and respecting another's own perceptions of their body.
there is some irony in using gender-neutral terms to accommodate everyone - once you get to know transgender individuals you may learn that gendered terms are in fact their preference.
one of the more interesting takes on creating new gender terms i've heard is not that they are being made up from thin air, but they have given names to things that have already existed.