Admin@beehaw.org currently presents as male and provides his name and other relevant biographical information in his public profile.
You assumed OP’s ignorance of admin’s preferred pronouns. That assumption was unjustified.
You misgendered admin by pressuring the use of gender-neutral pronouns instead of admin’s own, preferred pronouns.
I think you can do better.
It is an issue if .social ever decides to “Be evil”, and utilized their outsized influence over the rest of the 'verse.
Edit: The concept is known as “Embrace, Extend, Extinguish”.