Brian Mango, 22, was waiting in line when a white woman who appeared drunk reportedly started weaving in and out of the line.
Mango, who is black, said 53-year-old Wendy Bies told him, “Go back where you came from.”
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He replied and said his family came to the U.S. as slaves and that his mother was a refugee from Laos.
Bies then allegedly said all "his people" wanted free stuff, according to Mango.
The Chronicle reported that this made Mango feel uncomfortable.
A man who was several people behind Mango in line recorded the whole incident on his phone.
Bies was booked on the misdemeanor charge of obstructing a police officer.