For South Korean international student Annie An, a tutoring session at a Walnut Creek Starbucks last weekend turned into a nightmare. An, who’s attending a community college in the East Bay, was going over an essay with her tutor, South Korea native and UC Berkeley student Sean Lee, on Sunday, when a patron overheard the two speaking in Korean, KRON reports. “This is America. Use English only,” said the unnamed woman, who was sitting nearby using a laptop, according to An. An began filming the confrontation as Starbucks employees asked the woman to leave.