Armenta's mother, however, said on her Facebook page this week there was simply no need for the outrage ... explaining the boy's face paint actually consisted of both black and red colors -- in order to match his favorite team's hues.
As for the headdress, she said Holden is Native American.
"People are ridiculous," Shannon Armenta wrote in one post.
She also shared a few other snaps of Holden from the game ... and said, "Everyone asked to take a photo with him."
"The players even loved it!"
Holden's dad added on his Facebook page that his son is simply "The biggest Fan" of the Chiefs.
Kansas City's NFL franchise, meanwhile, has not addressed the matter ... though Elon Musk did offer his two cents on the situation on X -- boasting that his platform's community notes had exposed the initial backlash to the boy's costume as "deception."