I already heard that kind of remarks about Spain, but I've never had the chance to ask a spanish ATC about that.
I just want to say that we (ATC) sometimes consider the company nationality to work. But nothing to do with discrimination!!!
For exemple I presume that an Air Algerie or Europ airpost pilot will keep max speed to the final while a BA pilot will reduce to 180kts 30 miles north of the airport ! :-) . I know quite surely the kind of visual approach an Air France Pilot will perform..and so on...
Considering that , we sometimes make a difference regarding nationality, and it could be misunderstood by pilots....