Call it the reductio ad Baio — that moment when the politicization of consumer goods, or retail tribalism, reaches a new low of absurdity. It happens like this: Nordstrom declares it's dropping presidential daughter Ivanka Trump's product line. The president tweets against Nordstrom in high dudgeon. "Many women nationwide" (according to Breitbart News', ahem, unscientific estimate) cut up their Nordstrom cards in protest of the luxury retailer's decision.