If you think that's bad, you wouldn't believe all the crazy stuff people believe Donald Trump did while in office. If you took the name off and got rid of all the self-promotion and bombastic media stuff, people would think of him like an obscure post-Civil-War president you have to know for school and can forget after that.
I recall at some point last election cycle an interview with a very passionate gentleman in the north who was adamant that we had to "Vote for Change, its time to get Corbyn and his failed policies out of Downing Street". He was utterly certain that Corbyn had been prime minister for the prior four years and the terrible state of the country was down to him.
I am no fan of labour but that environment is not good for anyone and has ultimately (ironically) destroyed the Conservative party.