For people saying 'it's just a flag with a hood', would you be as chilled out if it was a symbol that looked dangerously close to a swastika?
The Ku klux klan may not have been a uk issue, but it is undeniably an offensive one, and surely if a costume, no matter it's intention, reminds people of a ku klux klan hood, it is not unreasonable to find it offensive?