You can call him whatever you want. I call him Theodore( my father in law, now long gone, would never even say his name, called him Theodore, and so does my family, go figure.).FDR
was almost as toxic as BO Tox himself.
OK, that is odd but I guess that I have heard odder.
As for FDR, the damage that that man did was/is close to incalculable but this was at a time when the US and the World were in the biggest peace-time crisis EVER. It is the 'big government' model that he set up that has enabled those following him to keep it growing, especially with 'eternal' government programs and intrusions.
I think that his ego drove him far beyond his intelligence and the damage he did to the US in staying past 2 terms just makes your head ache. By the Tehran Conference in 1943, he was so sickly that I think it allowed much more freedom to the Soviet Union and FDR's favorite Dictator, 'Uncle Joe' Stalin. I am truely perplexed at where I would put him in the rankings of US Presidents.