Zimmerman was acquitted of the murder of 17-year-old African American Trayvon Martin, who was allegedly shot dead by the accused in Florida in February this year.
Following the verdict, there has been uproar among communities, with many staging protests in the streets demonstrating their anger.
"How can I wear my stars and stripes proudly in a country where they make a big deal out of Mike Vick fighting dogs, but not a young innocent black male's life," Gausha told TMZ.
"When I represented my country in the Olympics, I was proud to wear my flag. I even wore it on my head on the way to the ring. What happened this weekend was a slap in the face."
Gausha, who competed at London 2012, has since turned professional.