Well, i do not think there is a real problem with flying a damn flag as long as people do not misinterpret it.
But to be fair, do you see many people flying a flag with a swastika on it? or a Hammer and Sicle?
Im not comparing the USSR and Nazis to the Confeds but they all have some thing in common why people dislike the use of their flags. War and suffering of human life, now although all nations have caused that it is because all 3 of those nations lost in the end and therefore the winners were able to feed propoganda about them.
And that is why people misinterpret things, because they simply believe what they are told. And please do not tell me that i am a Nazi conspiracy theorist. I don't like Nazis, fake communists or plantation drivers and a lot of other things.
Hell, if the south had won the war people would feel the same about flying the Union flag. People just have no sense of perspectives these days. Their whole life is like a damn box and all they can visually see is all they can think of.