Locals branded the monarch and government officials "killers" and "murderers" as they toured Paiporta on the outskirts of Valencia yesterday.
Residents are furious that an alert to mobile phones about possible flash flooding sounded two hours too late.
They also slammed officials' failure to respond quickly in the aftermath.
During the visit, mounted police had to keep back the crowd as they hurled insults at the shaken royals.
Their personal security team opened umbrellas in a failed bid to protect them from lumps of flying mud.
Letizia had mud stains on her face, while a bodyguard suffered a cut head.
Spanish PM Pedro Sanchez was evacuated from the scene by bodyguards after being "heckled and attacked". Officials said people "threw mud balls and other objects at him".
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