He was refusing to contribute his code according to the rules (by which everyone is meant to abide), avoiding regression testing and creating bugs.
And he certainly didn't help his case with tone deaf comments like this:
> If you're so convinced you know best, I invite you to start writing your own filesystem. Go for it.
There are no instances anyone can point to where I've caused regressions in other subsystems, in the course of developing bcachefs. I have had people introduce regressions into my code without following proper channels, though.
It's his kernel.
Changes should be in place in time for regression testing, if you cannot manage that wait for the next cycle.
Those same rules apply to everyone, and you're being called out for not only repeatedly ignoring them, but also for refusing to listen to that criticism.