I know a person who wears sunglasses on the back of his head. Thusly.

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Would the most ethical response be to (somehow nicely??) let the person know he looks like a fucking douchebag idiot? Or do I ignore it—much like I ignore the insane racist ramblings of my grandfather? Or is there a better, more ethical-ish way of handling this situation? YOU BE THE ETHICIST!!