Since he's gone now, I can't engage him in further conversation, but I want to send him an email saying that it hurts me when he makes sarcastic comments like this. I know that it's a difficult subject and I appreciate that he talked to me about it but put downs like this are not welcome.
This is what I wrote: It hurts me when you make sarcastic comments like this. I understand that you are worried about finances, but I don't agree to be an outlet for your negative feelings. It's a difficult subject and I appreciate that you brought it up and that we talked about it. I think it's important that we can talk about things without putting each other down.
Accept that there is only one thing you can change in life and that is you
