This is some crazy doublethink shit. It's clear just looking at the inconsistent interpretation from all the top-level comments that 'centrist' is a blanket term that both describes 'centrist' positions and also 'left/right radicals'. The only consistent is whether the subject is subjecting the in-group to criticism
The same user constantly harps on 'far-left' progressives complaining about democratic positions, and calls himself a centrist.
This is just standard 'out-group' gatekeeping. "If you're not with us, you're against us" shit.