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If you know or are someone who takes a flag (+pole) to a festival...
and waves it in a manner which would probably obscure most artists from ...oh I would say... MOST of the audience, including those at home, who for one reason or another, wouldn't mind seeing Neil Young or Blur without finding out whether you are canadian or indeed LOVE SAUSAGE!
If you are or know one of these people and don't say or think "gee that bout of innocent yet pointless flag-waving might have really annoyed quite a lot of people"...if you don;t think this or tell the flag waver this...then you really are a bit of a cunt!