Probably around the same rank of throwing the most noncompetitive pitches with 2 strikes on the batter.
That's didn't look like a strike in live action (or at least was questionable), but mlb app shows it was right at the bottom of the zone. So good call.
I haven’t heard any mention of replacing him. He doesn’t argue with the front office very often so it would take players going to the GM or more likely the owner to likely have him replaced.