^
Well there's some conservative carping about the New Black Panther Party, but I think BP and a perceived tie to the original Black Panther Party is tenuous, and it doesn't explain why there is such weak support among many mainstream (i.e. white) fans for other black superheroes. Black Lightning, Vixen, Cyborg, Steel, or new Azrael don't have anything to do with the Black Panther Party in DC comics. Nor does that account for Marvel's other black heroes, like Photon, Luke Cage, Night Thrasher, Storm, War Machine, Blade, etc.
All of these characters have had spotty publishing histories, right along with T'Challa. And attempts at solo books for most of them have not ended well. Despite whatever baggage there might be because BP shares the name with the historical party, he's had a better publishing history, as a headliner of his own book, than most other black heroes in either of the major companies.