A tech columnist has revealed how a grocery store clerk recently flashed him a dirty look when he refused to give a 30 percent tip during checkout.

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In a recent column, consumer technology writer for The New York Times Brian X. Chen recalled paying for his items on an iPad register, when the interface gave him options to tip between 10 and 30 percent.

His outrage comes after DailyMail.com readers revealed the most absurd places they have had to tip as they said they were fighting back against the tradition. More Here