the incident that made this occur was them going out of their way to be offended at being misgendered as “them”, as if they had the upper moral hand to get angry at force of habit.
That's not what happened. The admin did it once by accident yes, but after being corrected, he doubled down and blamed the user for being offended in the first place... which you're now repeating.
I said good on you for owning up to your bad take, but I'm starting to think you're not really sorry about saying what you did, you're just sorry someone shined a light on your behavior.