It always sounds weird to me when I hear people say "I'm fine AND you" when I ask how they're doing.
It doesn't sound natural to me, and it isn't something I hear in the US every day. I hear it mostly from people who've just started learning English.
Usually in the US when someone asks "How are you" the typical answer is "I'm good, how ABOUT you?", why isn't "AND" a more common choice amongst Americans?