Is anyone stopping them from 'being proud' of being from Britain? If they want to get together and masturbate to the Union Jack that's fine (I guess?) but it is when they turn their particular notion of what Britain is into action against others that it starts getting problematic. 

Personally I've always found Patriotism (and nationalism) to be silly. Im with Sammy J on this one, it really is the last refuge of the scoundrel.