It is pretty obvious. People who respect flag and country and the people who put their lives on the line defending civilization - the military, the police, first-responders - should express their views and boo the multimillionaire players who disrespect flag and country. 

People who hold America in contempt, hold the flag in contempt, think America is a bad country, think Kaepernick was right to wear police are pigs socks, think Kaepernick was right to revile capitalism, limited government, and freedom of speech should support the multimillionaire players who disrespect flag and country.