That's a great question... Anytime I say anything deep or clever to her, she's just like, "Huh? I don't get it. Explain it to me again." I think that's just how she protects herself and puts me down. She pretends that she's just not smart enough to follow me, but really she's implying I'm talking incomprehensible nonsense. So I guess I need to keep it simple, like, "I'm not interested in this so I'm hanging up now. Bye." And then hang up. My brother recently told me that almost every conversation he has with her, or at least half, ends with him hanging up on her.

Or maybe I should be less honest and just be like, "Sorry, I'm getting another call and have to go, bye." And then hang up on her...