This is a fair question.What race?
I do not think I could tell the difference between a Tutsi and a Hutu, but they were real enough to perpetrate a genocide, I do not think I could distinguish a Northern Irish catholic from a protestant (apparently it comes down to the letter J), but there is certainly a poster here who will detail the consequences of the difference. Clearly to Iberians, Castillians are different in nature from Catalans.
so we have posters here saying;
"Castilian Spain have sent their unemployed and internal migrants to Catalonia for Catalans to employ and feed them and as a result about half of the make-up of Catalonia's population come from people born in other places of Spain during the last century, hence there are so many "Catalans" against independence (Any Spanish citizen can vote, not only Catalonia's natives. Any person can be polled by Gallup, not only Spanish citizens but illegal immigrants who fear to lose their jobs in an independent Catalonia and will declare to the pollsters to be citizens)
... basically the hard working people (Galicia, Asturias, Cantabria, Basque Country, Navarra, Aragon, Catalonia, Valencia, Balearic Islands) feeding the imperialists (Castile, mainly Madrid, and Leon) and the any-time-of-day-is-good-for-a-siesta bumps (Extremadura, Andalusia, Murcia, Canary Islands)."
and another poster;
"What is becoming abundantly clear to many Catalans today is that Castilians are, as their historic track record indicates, abusive chauvinists who can brook no challenge to their cultural hegemony, and will use force still now, in the 21st century, with the same sadistic glee they did in the last century and before."
So we have a concept that there are 'proper' Catalans and those that are not proper Catalans and do not support independence. That Catalans are harder working than non Catalan Iberians. That non-Catalans are sadistic and abusive. Some how millions of people are being lumped together as being morally and intellectually inferior (slow learners) to Catalans.
I am not ashamed to call people out on this.
If Hlafordaes has scientific papers to demonstrate that Castillians are slower learners than Catalans then he can reference the papers - this is a skeptic site and people should be called upon to provide evidence of their claims. He can also provide evidence that central tendency is a reasonable way to attribute characteristics to a whole population with no evidence of skew, normality, mono polarity or distribution.