(WARNING: Some videos contain graphic language)

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San Francisco 49ers quarterback Colin Kaepernick upset many people when he decided to sit in protest while the national anthem was played before Friday's preseason game against the Green Bay Packers.

Now, some 49ers supporters are showing just how angry they are...

Several videos posted to social media show furious fans setting Kaepernick's number 7 jersey aflame.

“Welp when you don’t rise for the flag to show your respect for the men and women who fought and continue to fight for our freedom you start #losing #fans and well here is a video of my father in law#burning his #kaepernick #Jersey and now he is gonna need a new #49ers Jersey,” one angry fan wrote on Instagram with a video of the flaming jersey.

“People die every single day defending that flag you refuse to stand for and I won’t stand for that,” Instagram user Nate Haschak said in his own fiery video.

Watch Haschak explain why he burned his Kaepernick jersey in the "Fox and Friends" interview below, and let us know what you think in the comments!

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