I'm going to tell my husband I don't want to get things for him while his mom and him are mad at each other
Are you actually going to tell your husband that?
I'm already planning on doing so because he has become so whiney.
Your husband is going through a hard time so you should respect that and help him out. He doesn't need you to make things harder by not getting him the things he needs, it's childish on your part.
Don't you dare criticize me! I do whatever I want.
It is his mom and his feud, try to stay out of it. You will only aggravate him more by not buying him his stuff. If he's in a good mood, his argument with his mom is more likely to be resolved.