I had a similar problem recently while going for an endorsement. The instructor was a great person, but had no real people or psychology skills in dealing with different types of people.
He just got his CPL then his grade three and out training in a high performance aircraft.
The problem was due mainly to the CFI not coaching him in this area. When you’re training someone you have a minimum and maximum time that you expect a student or trainee to have grasped something. If the CFI is not watching over the instructor and keeping and an eye out on how your progressing something is wrong.
It was that bad I nearly walked away from the endorsement, as my flying skills appeared to drop and get worse, and then I changed organisations and the self esteem return real quick plus passed the test.
(It was all to do with people skills and communication. There is a lot more to it than getting an instructor rating) 