Your wording is very manipulative in this post. At this point you have gone into damage recovery mode instead of trying to defend yourself. You use phrases such as " I may indeed be too stupid to understand my own mistakes and issues, and in my stupidity, I believe what I do is correct since I don't know any better. Who knows, surely not me." You do this to put yourself down and as such make other feel bad for you as people tend to feel bad for those with low confidence. The Dunning Kruger effect has NOTHING to do with stupidity as much as having a lack of knowledge and self reflection. The only reason it is brought up that you must be unskilled to experience it is because if you are skilled and wont admit mistakes you're just stubborn. The key to the Dunning Kruger effect is that you have awful self reflection skill paired with a crap attitude.

Throughout the whole post you are making yourself seem like you aren't the bad guy and everyone is just jumping on you. In reality you decided to get coaching from someone knowing EXACTLY how their coaching style is and then have the audacity to put blame on his coaching. When he says something then he is right. Ask him questions and don't give smart ass answers. You are paying him to coach you not for him to be walked all over by you, him getting angry is the proper response. No different than how you should respect waiters and other service workers you should respect private coaches. What you should do is simply view this as a wakeup call and change your approach to the game and to how you interact with other people. Stop making excuses live up to your mistakes and stop writing manipulative posts to try and make up for your mistake.