My ABF tried to blame everything from the weather to global warming to the recession on me. When one thing didn't work, he tried another thing and another, and another, and on and on and on until he ran out of things blame on me and I ran out of patience.
In the beginning (pre-Al-Anon) I bought into his stuff but no more. Now, whenever he goes into attack mode, I let him be.
After all, I didn't cause it, can't control it, can't cure it therefore, can't be blamed for his lot in life.
A lot of detachment plus a touch of anger and reading my journals about things past helps keep me motivated to steer clear of his insanity.