so sorry your father did this to you. Bringing up your issues in front of strangers was inappropriate and thoughtless.

Do you have to go to Christmas with him? If you feel that you do ..maybe you could pull him aside as soon as you get there and tell him "it's christmas and I want to enjoy it. PLease do not bring up my mental or financial issues. I don't want to discuss it"

If he does it anyway, tell him the same thing "I'm not going discuss this now"

It's hard to deal with a bullying parent who doesn't understand, but you will feel stronger and better about yourself if you stand up to him.

Wishing you a peaceful Christmas