I agree with Joseph. Those who are saying the US is a traitorous flag are being absurd. So in the UK they shouldnt fly it, ok that does make sense
At any rate today it is a symbol of racism. It is not a coincidence that the flag was raised on the SC courthouse in 1961 during the civil rights era.
Also consider the fact that the Confederate flag is often flown by neonazis and even in Europe where they have no connection to “southern pride” in coutries where the swastika is banned neo-nazi groups often go with, what they must view as the next best thing, namely the confedare battle standard.