How about "lactose bigotry" instead of "lactose intolerance" https://scholar.google.com/scholar?q=%22lactose+bigotry%22

TIL I'm a lactose bigot

We all are, at some level.

Speak for yourself, I don't see dairy.

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That would look good as a title on a nice business card. Letterpress, maybe.

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So the euphemism treadmill is spinning the other direction

The euphemism treadmill has not been unalived.