It's definitely not his first mistake of the season. It's his first mistake which has led directly and obviously to a goal. He's made plenty of misplaced passes, punched balls he should've caught, been in the wrong position to save a shot, charges out to narrow the angle when he should've stated on his line etc? And him doing those has definitely cost us goals in the previous 2 seasons at times and surely are more comparable to missing a shot?
Every player will make several mistakes a game it's the nature of the sport, I just think Kasper seems to be bizarrely above criticism when he does make them from some of our fans who were no doubt the same ones castigating Nugent when he gave the penalty away towards the end of last season.
No one is saying he's a bad keeper but I just found it bizarre so many people were jumping to defend him and saying it wasn't his fault any more than our strikers for us dropping 2 points when other players have been slaughtered for similar or far less.