It was this exact part of the conversation that touched me negatively too. marsf expresses some very valid criticism that, instead of being publicly addressed, is being handled by "let's discuss it privately". This always means that they don't want to discuss, they just want to shut you down.
I don’t think so. Working in tech with many busy people, I say “hop on a call”, but only in “let’s sync live, it’ll be faster” situations.
This stuck out to me as rude. I would never say that to someone on my team who expressed serious concerns, far less than this person quitting after years of dedication.
I would offer an apology, explanation, and follow up questions to understand more in public, then say I’m happy to set up time to talk privately if they would like to or feel more comfortable.
In my experience, and in my feeling as someone reading such things, you need to tone-match. The resignation message was somewhat formal, structured and serious in tone. Replying in such an informal tone means that you are not taking things seriously, which is insulting. Even more so because that informal answer is public.
I'm tone-deaf by culture and by personality. I often make those kinds of mistakes. But a public resignation like this is a brightly flashing warning light saying: "this needs a serious formal answer".
What about the reply in the link indicates to you that the person has empathy for marsf’s complaints and is willing to change anything at Mozilla in response to them?
For the reasons I stated above, the response comes off as faking understanding to manage a PR issue rather than genuine empathy and possible negotiation, but I am often wrong about many things.