This isn't a very likely place for making enemies, so you may not get the dust-up you appear to seek, even though Ina Garten has many enthusiasts.
Barefoot Contessa was the name of a takeout store in the Hamptons (on Long Island, New York) that Ina Garten bought in the late 1970s and ran for about 15 years. It was named (not by her) for the 1954 movie with Humphrey Bogart and Ava Gardner. Food sold at BC had nothing particularly to do with Italian cooking, nor have any of Garten's subsequent cookbooks made any claim to specialize in Italian food. The focus is fairly simple but delicious food for casual entertaining (and casual-but-elegant entertaining). [True, EYB has categorized one of the repackaged collections of her book as 'Italian' among other categories, but in error, I think.]
One reason for the popularity of the BC books is that the recipes are reliable and well tested. Another reason is that Garten has a television cooking program that is one of the more appealing of the many out there -- the food looks great, and the cooking seems easy and approachable.
The BC books and TV shows have quite a bit in common with those of Nigella Lawson and Jamie Oliver. There are no BC spinoffs of any kind that I'm aware of -- cookware, food products, magazine -- just the shows and the books. From the EYB listings, it appears that there has never been an edition of any of her books produced specifically for the UK market; there is what seems to be a simple repackaging of four of them published in the UK in fall 2011. If that's so, and those four are not at all revised to reflect UK ingredient measures, it's a regrettable move by the publisher.
[Edited to correct errors and be more responsive.]