So, the triage person is misstating the circumstance, reframing it to introduce pain -- thank you dictionary.com -- pain via calling it a threat.
Speculatively, perhaps the triage person has evolved a defensiveness that includes hostility from historically being harassed directly or indirectly through their free support to the public position, and having some identity wrapped up in the software, and then feeling pain that way. That's just speculation. They do talk about going and drinking a beer, elsewhere in this chat, and alcohol use is associated with emotional dysregulation, bidirectionally.
So, to help out in this circumstance, perhaps an AI could be used to triage some of these issues.
Like, an AI that knows everything about the product in question, and says
a) this is the documentation repo, would you like me to move this issue to the main repo where we can discuss this properly, and
b) that feature already exists in the form of blah blah blah.
That would ease some of the more tedious triage workload the person doing the triage, hopefully give them space so that there are a few of these incidents deriving from this specific set of causes.
What, do you not include links to every single one of your social media accounts in every single post you make on GitHub? I think this is a very cool and normal thing, and not a concerning red flag about narcissistic tendencies at all.