NASCAR legend Tony Stewart just fired a huge shot at Colin Kaepernick -- calling him a "dumbass" and an "idiot" over his National Anthem protest.
"I'm sorry but @Kaepernick7 needs to learn the fact about police before running his dumbass mouth," Stewart said on Twitter.
"He has no clue what they go thru! #idiot."
Stewart is essentially echoing the sentiments of the San Francisco Police Officers Association -- which claimed the QB showed an "incredible lack of knowledge."
So far, Kaepernick has yet to respond to Stewart or the SFPOA.
