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I was having a conversation with a friend and happened to say "You know a lot about me."
She responded with "And you, me." I've heard this construction before, meaning something along the lines of and same with you to me. However, I'm wondering is this is a grammatically valid construction? It seems too minimalistic to be valid, but it conveys the idea perfectly.
This is an acceptable sentence construction.
From TERMIUM Plus (the Government of Canada’s terminology and linguistic data bank):
A comma may be used to indicate that repeated words have been omitted from the second clause in a compound sentence:
The African countries sent six representatives; the Asian countries, five.
In your example, the comma is used in a second sentence immediately after the first—rather than in a second clause in a compound sentence—but the same principle applies.
The exchange can be thought of as:
You know a lot about me.
And you[,] [know a lot about] me.
