Earlier quoted context omitted.
I think your projecting your own feelings onto the parent comment by adding "you must be toxic" to the beginning of that sentence. The only thing the parent commenter said is that the pattern of one's use can feed into the toxicity of their feed, without any judgment of that pattern per se. Nontoxic patterns that lead to toxicity exposure could be something as simple as "likes to read and post (non-toxically) about p…
I think you’re probably right about the intention of the original comment, but that doesn’t change the fact that it puts the responsibility on the user to change their habits to avoid toxic content, instead of on the platform. These platforms use our conscious actions (what we like, who we follow) and our subconscious actions (how long we linger on particular posts, what kinds of posts keep us on the site longer than…
Why do you think this is true? Taking action to control what you can of your own welfare is entirely orthogonal to and doesn't diminish at all the responsibility of other actors. It's just wallowing in self-destructive victimhood to pretend that you can't take self-protective action while still advocating just as strongly for actors like Facebook to be held responsible.
Ie, the leap you're describing from "you can use Facebook healthily" to "Facebook bears no responsibility for the unhealthy usage patterns of most of its users" is one that no one but you (and the commenter you're agreeing with) has made.