Any advice/Input appreciated (long post)

When we and my husband moved we decided to move in with my husband's mother to help her out with bills and give us time to save up some money and look for our own place.

My husband and mother in law got into a stupid argument about a chair and where it would stay. Eventually he got pissed off went to grab the chair and threw it out of our room and knocked a hole in the wall and shut the bedroom door.

I'm not used to this sort of thing and don't know how to handle it. Eventually I went outside and called some family to check up on them and calm myself down.

So I come back in and eventually suggest he apologize to his mom, it is her stuff and she's renting the house after all. He refuses and points out how she acts when she doesn't get her way like that is any reasonable excuse for his behavior.

At least he tried to patch it up and fix it afterwards, but for some reason he seems to think as long as he can replace or fix it what he did isn't a big deal and I shouldn't make a fuss over it and should move on like buisness as usual.

It's concerning enough to see someone throw things in a fit of anger and I feel it's worse to minimize and dismiss it the way he has when it's destructive. I don't think he would ever hit me, but I'm not ok with him just breaking stuff like that.

Am I at all overreacting to this situation? How would you have handled it? How long do you think something like this would take you to get over? Any input and advice would help. I haven't really talk to him much since but things can't just stay like this.