Why do particular fringe groups hold the Confederate Flag in high regard?

It was a battle flag, and the Confederate soldiers flew it to show that they were proud of their heritage and the southern U.S. Obviously the south wanted to secede from the union, and they flew it to show the north that they could f*ck off. It's no different from people in the U.S. flying our stars and stripes flag...it was/is done out of pride.