Re: What to do if he ignores me?
It seems he operates in a passive/aggressive manner. Thats not good, its rather childish, and likely a learned behavior.
You need to call him out on it. I wouldn't come across as weak though. I would stand firm and tell him his behavior is unacceptable, and he is acting childish and you are not his mother. Tell him he needs to learn another form of positive communication.
I would also suggest IC for you right now too, tell a professional what you have told us here and maybe they can give you some ore tips on how to handle it.