The customer confronted sommelier Corbin Goldstein. She explained the surcharge covered health insurance premiums for the staff, something most restaurants do not offer their employees. When he objected, muttering about “socialism,” she removed the 2 percent charge — about $6 — from his bill. She also offered to remove the 20 percent service charge, but he let that remain. Then in signing the check, he wrote a big zero with a slash through it on the tip line and added an expletive phrase that begins with “F” and ends with “You.” Benchimol, in her social media post, vented about how her staff had been treated by this Scrooge-like customer.