To provide further context, the general consensus from the catalonians in favour of independence is that the people in the south (Andalucia) are lazy idiots who dont feel like working, and that their tax money should be spent on catalonia, not the lazy andalucians. Catalonia is a major contributor to the spanish economy, and neither side can afford to lose the other.
The general perception that andalusians are lazy is just as valid as the idea that all polish people hope to leech of british society-it's simply overgeneralizing to antagonize a foreign scapegoat.
There are many places in Andalucia that absolutely are shitholes. I distinctly remember that the police force in La Linea (the spanish town on the other side of Gibraltar) had to take the bus, simply because they didn't have enough money to have police cars. This deffinately isn't a one off case either.
What's most frustrating is that this situation is so nuanced it's almost impossible to actually apply yourself to the situation without having lived it for years, and even then it is extremely challenging to do so.