It’s not an echo chamber on OTIB in my view, yes a lot of people feel as per this thread, maybe the majority now, but there are plenty who still support Manning, Tinnion and Lansdown.
As for the average fan what does that mean? The Cardiff game saw fighting in the stands amongst ourselves, booing and chanting; we also had booing and chanting at West Brom.
Your world view may well be different and I appreciate that; for me, OTIB is the most balanced and relatively calm about the situation. Away from OTIB what I see, read and hear is far more toxic.