Some of the historic hatred for them in Spain stems from the alleged links to Francisco Franco's regime.
Think a lot of fans (more recently) also hate the apparent level of entitlement to transfer targets and the way in which they seem to be able to "hoard" players in a fashion that all but the State-owned clubs can't.
Also think a lot of fans have hated the years of time-wasting, rolling etc along with alleged bias with refereeing and UEFA.
Hope this helps.
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