I don't think Barb was being sarcastic. I bet she said "if I were a young girl your age I could see me wanting a guy like you" and Chris being a doofus ran with it.
Either way, I understand his reasoning for hating Barb is narcissism but still, weening himself entirely off of that decrepit, abusive woman is good no matter what the reason is. He seems to hate Barbara a lot now which is at least something most KFers would agree with, I suppose?
What should happen is Chris should really somehow foment a trusting relationship with a new person in Barb's place and said person would undo all of the BS Borb is responsible for feeding him but obviously that is just a dream.