Cassandra was hated

But not because she was wrong 

Lots of denialism…

Not wrong, just early…

and, by the way, masks work

 Cassandra, in Greek mythology, was a Trojan priestess dedicated to the god Apollo and fated by him to utter true prophecies but never to be believed. In modern usage her name is employed as a rhetorical device to indicate a person whose accurate prophecies, generally of impending disaster, are not believed.