Not so according to the Celtic nationalists of Cornwall who seem to consider the St. Georges flag of England "foreign."
This quote from the second linked article stands out to me the most:
To me this is absurd. Cornwall is part of the UK. Despite it's Celtic roots. Denying this is absurd. they don't have their own country (as much as they would like one I'm sure) so perhaps they should learn to live with it without being offended by such trivial things.
But Michael Chappell of the Celtic League said he had received ‘many complaints about the oncoming flood of St George flags’.
He added: ‘This is a foreign flag here and can be quite insulting to some.
‘If Cornwall had its own sports teams I am sure we would see more of our own flags [pictured] rather than foreign English ones,’ said Mr Chappell, adding he hoped England would ‘fall by the wayside early in the competition’.
I am not sure why but this does annoy me.
I think it's because even having the stones to suggest such a thing is insanely stupid.