Too late now, but the answer is to stay stum, say nowt, not your problem and you will be damned if you do or don't.
Your brother is clearly very opinionated and cannot accept hearing anybody else's unless it agrees with his. Sounds just like mine. Haven't even bothered telling him about my divorce, he never asks how I am or about my life and would just make an acid remark.
Maybe he'll cool down in time, maybe not, but if he does don't mention it again and if he does decline to talk about it.