edit: FWIW, I regularly see people disclose their association if it seems relevant ( "shameless plug" is perfectly acceptable for example ).
edit2: I thought a little more about what you wrote and I disagreed with Linkedin/Nextdoor posts before, but the last thing that kinda turned me off is a clearly political message that you could tell was written in the most divisive way possible to drive 'engagement'. And short online trek later, it turns out, the same person posted the same thing on their other social accounts. Since it is genuinely harder to tell what is a genuine conversation, I just opted to stop it altogether. HN has its issues, but at least I can typically expect someone to make me hesitate based on their arguments.