The fact that the Spanish generally are known for their dislike of Catalans? How about you go do some googling of Spanish history in the past 100 years? It's too political to discuss without getting told off.
I think their feelings towards one another are generally mutual. Catalonia is Spain's wealthiest region and it's a source of the friction as a lot of Catalonians would rather their money didn't go to the treasury in Madrid but stay in Catalonia.
Erm...goes back a bit further than that http://www.jstor.org/stable/30098166?seq=1#page_scan_tab_contents
But it's more than just the money. Different language too (was illegal to speak Catalan under Franco and the Falange).
I went to the Costa Brava the month Barcelona signed Cruyff.You got service before the Germans as the Catalunyans still had memories of the Germans helping Franco. The Camp Nou was the one place they could use the language. Supporting Barcelona was as much a political statement as anything else. The government assistance Real Madrid received then and since still rankles with them. Best memory was in a bar watching football results come in. There was a newspaper with a picture of the team and 45,000 in the headline. Some Scouser piped up about Barcelona can't be that big, we get that many. A Man Utd fan chimed in with the same. "At two thirty on a Wednesday afternoon for the team photo?" Asked the barman. End of discussion.
His main aim was to keep power. Spain dropped way behind and didn't start to grow economically until he shuffled off this mortal coil.
At least if they didn't like it Spaniards were free to leave. Something the bosses in the Soviet bloc didn't allow. My first boss was someone who had left because it was too formal and conservative with a small c for his tastes. Though when I went and was sat out at 3 in the morning and the locals left their doors open with no fear of being burgled you thought that compared to home and last orders at 10.30 and not daring to leave things unlocked it didn't seem too bad. Reality of course would be a bit different, a bit like those who go to Cuba for a couple of weeks and wax lyrical about it without having to face the day to day problems of locals.
Loads of Spaniards who supported the Republic left the country. The workforce was depleted and the Americans didn't trade with Spain until the 1950s. He wasn't even a fascist. He was a reactionary opportunist.
The main aim of those in power in one party states is to keep power whether they be of the left or right. Yet it recovered a lot more quickly than the communist countries when they won their freedom so he can't have left it in too much of a mess.
