If it makes you feel better, they were when we played Millwall.The commentary were absolutely gutted when Swansea were 2-0 up, when City made the comeback they glossed over the clear robbery that had gone on to wax lyrical about City. I remember the days when commentary were always bias TO the underdog
I think they generally like to go with the scoreline, and ignore when that scoreline is down to the officials.
That's not to say they won't highlight the officials mistakes at the time, but they'll then immediately ignore those mistakes and state how the scoreline is justified.