Fans attending Sunday’s National Football League (NFL) game at Chicago’s Soldier Field say it was disrespectful for the Pittsburgh Steelers to boycott the National Anthem – especially, given the venue.

“For the sake of God, we’re in Soldier Field. If you’re going to stand for the flag, and for the National Anthem, this is where you do it at,” one fan outside the stadium told CNN after the Steelers refused to come out of the locker room for the playing of the anthem.

Other fans said an NFL game is the wrong place for political protests, and that the Steelers were disrespectful, not only to the country, but to those who serve in the military.

Only one Steelers player, Tackle Alejandro Villanueva – a Bronze Star-decorated Army veteran – took the field and respectfully honored the flag during the playing of the National Anthem, Townhall reports:

“One Steeler was not cloistered in private with the rest of his teammates as the song was performed this afternoon. Former Army Ranger Alejandro Villanueva, who earned a Bronze Star in the Afghanistan War, was on the field, standing with his hand over his heart. God bless him, and the country he valiantly served.”

Sales of jerseys have since skyrocketed, making it the hottest-selling item of Steelers apparel, and one of entire league's top-selling jerseys, CBS Pittsburgh reports.