Could have been worse. Kirpe might just have been booked, then Celtic beat us with a goal in the last 5 minutes.
Regarding the standard of refereeing, I agree it needs to improve, but not sure how you go about that - at least in the short term. There's only a small pool available, so they are all "guaranteed a place in the starting 11" as it were, and can't easily be replaced. It's not like there's a dozen better refs sitting on the bench waiting for their chance.