By all accounts, Sebastien, a former "America's Got Talent" performer, brought the house down with his rendition of "The Star-Spangled Banner." Some viewers, however, fired off racist comments on social networks like Twitter following the performance.
The young singer spoke with KENS-5 about the backlash.
"With the racist remarks, it was just people how they were raised. My father and my mama told me you should never judge people by how they look," Sebastien said.
The singer specializes in mariachi-style singing and performed the National Anthem in a black-and-silver suit, inspired by his hometown Spurs.
"When I started mariachi, I knew there was gonna be a lot of politics," Sebastien told KENS-5. "And I'm just a proud American, to be honest."
San Antonio Mayor Julián Castro tweeted his support for Sebastien.
Sebastien posted his own tweet, letting his supports know that he wasn't paying attention to the haters.