That would explain being indifferent but nothing there explains the extreme hatred to the level of thinking a failed businessman with multiple bankruptcies, bankrupt casinos, racist statements, and major sex scandal issues would be a preferable president.
She had a respectable if mostly centrist voting record in the senate in 8 years and even voted in line with Bush 2 almost 50 percent of the time. Absolutely nothing in her record screams extremist or communist. If anything is screams pragmatic centrist and definitely nothing for Republicans to hate so intensely they'd turn the country over to the vile evil ineptness of a trump.
The entire republican voter population was victim to pure lies and propaganda. Never once actually cared enough to check the record and get it straight on either of them. An easily fooled population that votes with it's feelings is the Achilles' heel of America.