I completely understand your perspective, but I’d much prefer having a manager like Kettlewell who refuses to doff his cap and simply accept the status quo. In my view, the more he calls out the shambles that is officiating in action, the better.
It’s worth noting that his approach could easily boost morale and foster an "us vs the world" mentality in the dressing room, which is no bad thing.
I’m not referring to you here, but the reality is that Kettlewell can’t seem to win in the eyes of some fans. If he manages with passion, wears his heart on his sleeve, and kicks every ball like we do in the stands, he’s labelled a "twat." Yet, if he kept quiet about the poor decisions, avoided making waves, and let it all slide, he’d likely be called a "twat" for that as well.
What I hope is that fans recognise a manager and team who are clearly on the same page, putting in the effort and having a decent season. We should be backing them, supporting the manager and club when they call out dodgy decisions, not tearing them down for it.