There's nothing anti-British about not wanting to sign McTominay or Gallagher. Most people are happy with the likes of Tierney, Maddison, Rice etc...
Some of us just don't want to be scraping the bottom of barrel for players that aren't very good - Especially from Man Utd where we've been lumbered with pricks like Butt, Smith and Obertan over the years. I'd personally have a "no Man Utd cast offs" policy in place.