Well, you’re off to a good start! Just need “uck” to go with that F and you’re golden!
Joke aside, this may be one of those situations where Corpspeak would just serve to make it worse, either by rendering your message inert, or by generating long-term tension. And, believe me, that tension gets really suffocating really fast.
I think your best bet at this point would be to readjust your view and approach with this coworker. My aunt told me a secret which helped me a lot in theatre, but I’ve learnt it also applies in pretty much every other situation: “if they won’t be your partner on stage, then let them be furniture.”
You have the immense advantage of knowing what to expect from them, which is essentially nothing at this point. I’d say the best response is to offer the exact same in return - if they ever need something from you, dodge, postpone and obfuscate. Fuck’em. Not worth wasting your energy on this situation, it only leads to stomach ulcers.
Well, you can’t really do that when it’s expressed in written form as long as it’s not part of a grander “manifesto” of sorts. Or better put, as long as it’s not grounded in a context.
This can only be solved by slapping as much nuance as you possibly can on everything you write, make it incontrovertible in its clarity.
But if you’re not in the mood for an adjoining essay whenever you want to post a one-liner (seriously not being snarky about this, I completely understand the feeling of utter tedium when having to explain the same damned thing for the twelfth time), you can always monitor the reaction then provide clarification. Once you’ve done that, you really don’t need to engage any further.
And the most important aspect is to never forget that this is the internet. Some people are in it just to stir up shit, and that’s a game you win by not playing.