I am sorry to hear this. It is not clear from your message whether that is the first time he is acting in this way, but it seems like there is more to it than just anxiety. Has he been acting like this often?

If he needs to "take care of himself" I say let him think about this for a while, it indeed sounds like he has some things to work through, but his reactions are a bit over the top for the situation you described.

Why would he hate his dad, what is his relationship with him like? Did his dad do anything to trigger this comment from him?