ESPN

ORCHARD PARK, N.Y. -- Before San Francisco 49ers quarterback Colin Kaepernick knelt during the national anthem of Sunday's game against theBuffalo Bills, a loud chant of "USA, USA" rang out at New Era Field.

Some interpreted the chants as questioning Kaepernick's patriotism for his protest of racial inequality and oppression in the United States. It was an implication Kaepernick vehemently disagreed with after San Francisco's 45-16 loss.

"I don't understand what's un-American about fighting for liberty and justice for everybody, for the equality this country says it stands for," Kaepernick said. "To me, I see it as very patriotic and American to uphold the United States to the standards that it says it lives by."

In continuing his protest, Kaepernick on Sunday knelt during the anthem for the first time as a starting quarterback before a regular-season game; he was again joined by safetyEric Reid and linebacker Eli Haroldin supporting the cause.

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