Really would you accept that behaivour from any one else? A friend? etc

Just because he is going through a lot doesn't give him the right to take it out on you, wanto is right and you should certainly walk away and explain your reasoning for doing so in a calm gentle manner. And suggest some other ways to take out his frustration as said before.

You can also ask someone else within the body to talk to him about it, and suggest better ways of dealing with it and explain that being mean to you is not acceptable, because it is not you who has hurt them.

I hope it gets better for you