You must stay as calm as you can and for as long as you can, only time will show him that he is the one doing the arguing and eventually he will see youre not taking the bait and joining in.. It your fault is a very childish and immature way of dealing with things but hopefully over time your C will give him better ways of dealing with it!
This is it. He is still acting like a child - "You can't make me". So I will not play those games. I've decided he is not invited to the party this saturday even if he were to change his mind.
And my birthday is coming up - I've been dreaming of a nice night together - but I can see this is another set up for him to deny me and try to upset me. So I'm not even going to mention my birthday. Since he is acting childish, I expect him to act childish and ignore my bday hoping to upset me. So he won't. I'm going to make plans for my birthday and if he does or says nothing, he is the one who looks rude, not me. If I get upset, I look immature and I won't have it.
Now please remind me of this when my birthday comes in two weeks