There were indeed black slave owners. In many southern states free Blacks could own property including slaves. In Missippi, one could argue is the most quintessential “Southern” state, free Blacks could own property. Some even owned plantations, mostly around Natchez, and they owned slaves and they treated them like slaves. And as I’ve said, some Black slave owners just bought their relatives to free them.Have you ever been personally blamed for slavery? Had it effected your life in any real tangible way? Or are you just looking for something to be offended about? And no, "large numbers" of black people didn't own slaves. In slave states black people couldn't legally own property.
Have I ever been blamed for slavery personally? Well not personally, but collectively as a white person, the first time was in the 5th grade back in the early 70s. There have been many mire times since. Does that count?