I told my husband he needs to start having my back with my son about this whole working at his school thing

I've been posting about how my son is pissed I'm subbing as the gym teacher for his high. I embarrassed him the first day because this senior boy he likes was horsing around with them and the boy made my son fall on his face and his nose started bleeding and I went mama bear. Then I accidentally embarrassed him yesterday because in gym(my son is no longer in gym) this freshman girl said something and I went off. Too much though because I got called in to speak to the principal and they said if I do that again I'm fired. And now because of the nose bleed accident everyone knows I'm my son's mom and now he's saying I'm ruining his life because of how I acted in that class. I called in today because I'm so stressed with no one being on my side. Last night my son said that as long as I work at his school he's disowning me as a mom and went to his room. My husband was again reading his book and saying nothing so I went off on him saying he's been no help or support towards and is teaching our son he can act this way. My husband says "Do you even want to know what I think?" I yelled yes and he says (more or less) " I think you don't care what I think. I think you just want me to agree with everything you say, and if my opinion is different you want me to sit here and nod my head yes to everything you say so you can hear yourself talk. I've been burned one too many times with this shit with you so I've learned to keep my mouth shut. I also think the reason you're working at his school is because you're trying to live the youth you didn't get because you decided to drop out and get a GED and missed out on high school. You know this has nothing to do with you being good at volleyball. If it did why not just go down to YMCA and play volleyball with the adults on Tuesday. Oh right because validation from a bunch of High schoolers. You wanted to be seen as the cool young gym teacher that high schoolers consider a friend but since you're not you're calling the kids vicious. I think you have no place teachings children ANYTHING and you know why you're probably not very "respected" there. Because most good teachers don't dignify what a, what? 15 year old girl girl said with a response. Especially with a response like that. You're 38. You can't get down on mean girl level with a 15 year old just because she said something you don't like. You made yourself look childish and immature. I think you need to let our son have his High school year. Crush on boys. Do his thing without you trying to regain your lost high school years. But of course you're not going to do that because you feel you deserve to gain back those years you lost and this is your opportunity to do so. Now tell me did I hit the nail on that one?" I said nothing and he says "Now I have 3 weeks to finished this book for class and I'm barely past chapter 2. I'm OUT of this". So that's how that went

Okay fine! I'm wrong whatever. How do I go about fixing the situation?