I think leaving an argument with ‘I’m not going to talk to you anymore, I’m going to bed and when I wake up we’ll still be married’ is very specifically rooted in and egotistic mindset.
...I mean, because I did listen I heard him say “go to bed angry.”I think you finding implied 'sustained anger' means you didn't really listen, or are stupid. But I don't think you're stupid. Because there is clearly NO implication of sustained anger. In fact, he doesn't even MENTION anger. Not in the least. He made no insinuation to treat the other partner rudely, or to hold grudges. In fact, I think even a 10 year old would understand the guy is saying Cleave to the partner. That's the opposite of ego. That's the opposite of anger.
You even put the word “angry” in the topic title because it was what he said :/