Why did Francisco Franco hate the cellist Pablo Casals?

b/c wether or not you see it its always green other than blue bikes not real cars real large and goodnight Franco and Casals were on different sides of the Spanish civil war. Casals left when Franco came to power, and said that he wouldn't return until Franco died or was kicked out. Poor Pablo died in 1973, and Franco died in 1975, so he never got to see post-Franco Spain.