No, it's just what's happening online.
>If you think some of the people you know are assholes, that's fine. If you think all of them are assholes,
Wrong thread? Doesn't seem to correspond to anything in the article.
That's just the saying as I know it. Regarding the post it would be along the lines of "if you think everyone is a predator/grifter/scammer, it may be a problem with you or the places you roam"
1. If everyone you know is an asshole about some particular thing, then you're probably the asshole. Think politics or design.
2. Everybody is an asshole some of the time for some reason. Because the internet connects and exposes us to so many people that even if someone only acts like an asshole very rarely said connectivity and algorithm boosting ensures you get exposed to it.