The job of the manager is to improve the team at half time. His method of saying 'thats not good enough' at half time when were 1-0 up has not worked. Second half we've lost the plot.
Pretty worrying to be honest.
It is but it's a learning curve for him. Do you think the likes of Fergie and Jose Mourinho are ever happy? They never look it but they are great managers. I'm sure they have had a few half time rants in the past even when their team has been winning. Hopefully he has learned from it.