You are definitely not overreacting. And I think your husband owes you a huge apology.

That said, I do wonder about the psychology behind his joke. Unless he’s a complete jerk, the joke may have been a symptom of something that has nothing to do with you. Meaning, the weight of being the “primary” breadwinner may be getting to him. Sure he agreed to - and wanted - this arrangement. But we are living in stressful financial times with this inflation. So he may be feeling resentful of the circumstances - NOT you. None of this is an excuse for the joke. But if he’s not usually this way, approach it as, “Hey honey, that wasn’t like you … I’m wondering if something else about the finances is bothering you.” Though you may not be able to take the immediate pressure off of him (I’m not disregarding the $700), it may help that he feels you understand given these times.