Male Bovine Fecal Effluvia. The Stars and Bars is a symbol of honor and valor.
It's the PC brigades such as the NAASomeCP that have bastardized it and tried to change the meaning.
The Confederate battle flag [CBF] was first politicized, then bastardized by Southern segregationists and their minions in the Invisible Empire starting in the 1940s. It was represented for decades as a symbol of segregation, racism, and defiance toward civil rights for black Americans. With nary a peep from the so-called heritage preservation groups of that era.
Placed in that context it doesn't seem too difficult to understand why black political groups in the South have a problem with the CBF being displayed in public places. One is tempted to say " ya'll made yer own bed, now sleep in it".