From what I remember, Mosley didn’t like the Nazis either, he was a fascist, don’t get me wrong, but he disslike the Nazis because well… they threatened what he wanted to do IE continue the British Empire and turn it into a fascist state, also Churchhill wasn’t even Prime Minister when Mosley was prominent.
And oh what support Hitler and them did have went out the window when the Nazis began bombing the shit out of Britain. That tends to make people hate them ontop of all the other atrocities they were doing in other conquered nations too that you flatout refuse to admit that they were doing in the first place because you desperately want to blame the Jews for everyone no matter how illogical or batshit insane it is.