Shaking someone's hand, touching a doorknob, sitting in a chair, etc. probably transfer far more germs to your body than a double-dipper.
I think it's going a bit overboard to get all uptight about someone dipping a chip after it touched part of their lips, and this is coming from someone who uses a paper towel to open a public restroom door.
I flip the chip around in mixed company though, just because some people get so offended for whatever reason.
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