I am always puzzled as to where your perceived notion of this statement comes from.
With so many threads on here, it's quite possible that I have simply not seen the posts where this has happened of course, and I have no doubt that some do have prejudices, just like some will do against the Swedes, French, Israelis, Arabs, Chinese, Cromer-ites et al.
In any case, being such a large, very wealthy country with 'interests' and vast 'influence' around the world, not to mention the culture increasingly seeping in to many other countries, it's bound to come into some criticism from time to time.