In my case, I can think of a few who might be worse than Trump or, at the very least, equally horrible.
Worst:
Andrew Johnson: Never elected, destroyed Reconstruction efforts and shoved black people back into the dark ages all over the South.
Andrew Jackson: Although a man of the people, he was divisive as hell and racist as ****. Trail of Tears make his the ugliest presidency, for sure.
Both of those clowns were worse than Don.
Kind of worst:
Gerald Ford: Never elected and then not winning the race he ran in, plus he pardoned the first proven Liar in Chief.
Not evil like Trump but equally as dumb.
Bottom dwellers:
James Buchanan: Like Trump, he defended slave states, stood up for racists and eventually ushered in the era of violence when Americans began killing each other (see Bleeding Kansas).
Franklin Pierce: Preceded Buchanan, but this guy was a Northerner who believed appeasing the racists down South by nullifying the Missouri Compromise was the answer. It wasn't.
"W": Seriously, this guy was a joke. If not for Trump, he'd be the worst president in my lifetime hands down. A fair assessment would say George W Bush was bad, but not quite that bad.