A Black cheerleader in Alabama is so LIVID over seeing her white H.S. teammates posing with a confederate flag ... she quit the squad and is now demanding school action ASAP.
Reagan Coleman says back in early July ... one of her chearleading teammates at Daphne High School posted a picture on Instagram that deeply disturbed her.
In the photo, six girls -- all of whom are white -- held up a T-shirt that read, "I Heart Redneck Boys" ... with a confederate flag placed inside of the heart's image.
Coleman told WKRG-TV in Alabama when she first viewed the picture, she immediately saw "hate.