Blahaj policy is very explicitly that it's a safe space, and transphobia and transphobia-adjacent content (and other forms of bigotry) will be removed. It's supposed to be somewhere people can go and have it taken as axiomatic that their neopronouns are valid, and therefore they won't have to debate them, so while it's pretty reasonable to say that you'd prefer people grew to be happy with they and neopronouns didn't become a permanent feature of English because they're awkward, it's not Blahaj-friendly, so can't be said on Blahaj, especially if you're going to repeat it a lot.
It's perfectly reasonable for people to like crisps, but it doesn't mean I have to let people keep adding them to my cake when I'm trying to eat cake.