Ken Ozeki has strong opinions about the tipping culture in America — particularly compared to his native Japan.Courtesy of Ken OzekiIn a recent survey, more than a third of US adults said "tipping has gotten out of control."Californian Ken Ozeki, born in Japan, said the Japanese don't feel obliged to tip like in the US.He told Business Insider he often pays in cash and picks up food to avoid the charges.Whenever Ken Ozeki buys a cup of coffee, he will tap the "custom tip" option on the swiveling tablet and round up the price to the nearest dollar.He would never consider paying the barista the 20% gratuity that has become standard in the US."I'm not that person," the 41-year-old said.According to a recent Bankrate survey, he's among a population of frugal — often frustrated — consumers.