He did:
A West Ham United fan has been fined after pleading guilty to a racially aggravated offence at a Carabao Cup game against Tottenham
www.theguardian.com
*edit - different incident but same issue
“The reference to selling DVDs is known to be a racist term when aimed at Asian footballers and is not the first time the slur has been aimed at Son by someone claiming to be a West Ham supporter.
Son was racially abused in November 2017, after he wound down his car window to pose for a picture with another fan. In a video uploaded to social media, the man – who is off camera – asks Son if he can get him a copy of the new Planet of the Apes film. “DVDs. You do DVDs. Good copies,” the man adds, before identifying himself as a West Ham supporter.”