When parents are bickering,

the child's heart beats go up, so he closes the door.

Your attention to your child's "problem" is distracting you from your real problem: your relationship with your husband.

Your disrespect and contempt toward your husband are alienating both him and your child.  You need to find the source of that discontent.  You may think that he has many faults, but focus on yourself first by thinking what you can do to better this marriage.  If he is 80% good, don't be bothered by that 20%.  If your focus is on that 20%, you are looking for excuses not doing your part.

Leave your child out.  Work on your real problems.  When the home is filled with love and laughters, your child will open his door.