Good point...and as noted earlier, both flags are usually flown on the same flagpole by said "racist" individuals. Yep, time to remove both flags...correct?
No, it is a pathetically invalid point that has already been thoroughly refuted in this thread, when the Swedish flag was used for comparison. In short, the US flag was not specifically created to represent the founding of a coalition designed specially and most centrally to preserve the practice of slavery.
The valid comparison is that the Confederate flags (battle or otherwise) are to the US flag, what the Nazi flag is to the German flag that both preceded and followed the 15 years of Nazi reign. Nonsense arguments rationalizing the Confederate flags "other meanings" are as absurd as if the similar arguments tried to rationalize flying the Nazi flag over modern German government buildings to "honor" that part of history.