So my SO thinks he knows what it's like to be home with a cranky sick baby all day long because…

So my SO thinks he knows what it's like to be home with a cranky sick baby all day long because "he's been here since 5!" Okay so what about the other 10 hours I've been with him and you were gone? Those just don't matter at all??!! I tried saying that to him and he literally covered his ears like a child and said, "you know what?! Whatever whatever whatever I don't want to fight blah blah blah" and wouldn't let me talk. And then when I got angry with him he told me to chill out! How about you grow the fuck up!