Real still has high-powered board members openly active in the Falange, including the descendants of Franco, his generals and Primo de Rivera running their respective neo Nazi organizations and actively encouraging neo Nazi hooligans. That's why the decent folks in Madrid support Atletico. I know the area and the football culture there. My late father was the Bangladesh ambassador to France, Spain and Morocco and I spent a LOT of time there.
Catalans and the Basque don't just "drag in" the Franco connection. What happened is unresolved and therefore unforgivable. Much like the Pakistani-Razakar issue here.
"O people, we created you from the same male and female, and rendered you distinct peoples and tribes, that you may recognize one another. The best among you in the sight of GOD is the most righteous. GOD is Omniscient, Cognizant." (49:13)