Nothing they said there seems unreasonable. They/them seems like a perfectly normal (and more importantly neutral) default way of referring to people. If I was in person with someone, and they started throwing a fit because I defaulted to they/them for them (which I usually do), I would assume they were a bigot who doesn’t understand pronouns.
Not saying that’s the case with these other people, but I believe there’s a reasonable limitation on how much you can expect strangers to assume/understand on first meeting.
This feels like the writing on the wall. When they won’t even pretend to support us anymore?