Emmy. I'm sending you a gigantic, huge, massive hug.
Your husband is so ridiculously abusive, it amazes me. Accidents happen. Period. It was an accident. You acted appropriately to get your son out quickly and there was no harm done. I've worked with firefighters, guess what, they're human and make honest mistakes too. They were being nice because they understand that it was an honest accident. You're a good person and an excellent mom, Emmy. Don't believe me, then call your parents, your sister, your cousins, your friends and co-workers and ask them too.
He is such an asshat. Next time he starts spouting off just tell him to zip it. Whatever his problem is it is no longer YOUR problem. If he doesn't have anything nice to say then tell him to go find someone who gives a crap about his negativity. It's not your problem anymore.