What short memories these guys have. Recent Democrat history is chock-full of similar hatred. Richard Nixon and Ronald Reagan were easily as loathed by Democrats. George H. W. Bush was only moderately less so.
I don't bother to ask why Democrats hate a particular Republican president. The hatred comes with the job. The reasons are manufactured as needed.
There are plenty of hysterical liberals who still hate Ronald Reagan. Even after the man restored America's place in the world, ended the Cold War, and gave us the longest period of economic prosperity in history.