Except “mainstream social media”, because everyone knows what you’re talking about, including some who’d be confused by “mainstream parasocial network” because they don’t know what parasocial means.
It's very clear. Empirically a common sign across all social media is basing very strong opinions on very vague personal interpretation of something that that will forever stay unwritten so it can't be challenged. Anyone can just cement their claim to eternal correctness by ending a personal opinion with some outrage bait like "anyone who doesn't agree with me is tiresome".