Like others have said, he sounds like a little brat that can't figure out how to deal with something "unusual" (beyond the fragile grasp of his own phaneron) taking place, outside of
his control; so he has to block out and recoil from all perceived transgressions instead of communicating (or God forbid just accepting something like a normal person). It's an obnoxious ogre of a thing that affects so many people... new parents surrounded by their own little world, especially. So it may help to know that if it wasn't one thing making his whole universe crash down around him, it would be the babysitter
daring to be four minutes late or the guy in front of him at the drive-thru ATM having the
dinosaur balls to make two whole transactions and wasting his
precious time. I hate to imagine how he would react to finding his car towed for blocking somebody's driveway.
So he's going to stomp his foot and bounce up and down and go into hysterics the way cranky children do. He thinks he's going to 'punish' you for sending
his reality into a whirl and refusing to read the script that his mind wrote for you, by assuming the role of the
though-lovin' cold-shoulderin' realist, at least until he thinks you'll be the perfect hand puppet he took you for once more.
And to repeat other people's posts once again; it is probably for the best to weed out the weeds. Relationships based on conditions (such as your being the 'cool uncle' or some other Bob-Sagetty nonsense) aren't real relationships because there is no relating taking place between any human beings. Just holograms of fictional humans saying what they think the script says.
Still, I am sorry that happened to you. Your stomach must have been doing somersaults.