In my job, I get critiqued on performance as well. It is part of the job. Either by superiors at previous jobs, or now by my clients who are either happy with my work product or not. It's part of life.
So people can post whatever critiques they want on football, whether scheme, play calling or personnel choices. That is part of the game. It is part of life. Just never make it personal. That is classless. Save that for rivals.