Chai Park and Jin Hee Lee, a law student and a lawyer, were stuck on line at a Manhattan Pinkberry last summer when they spotted the product seen here, an Alessi “Mandarin Citrus Juicer” that the frozen yogurt chain sells at some locations. They found the designer’s characterization of Chinese men as smiling toadies whose heads are great for squeezing juice a tad offensive. Though the Korean owners of Pinkberry insist the juicer has offended......