At the start of the war, British people regarded Germans as 'more like us' than the French or other Europeans. There is the well documented case of fraternisation in the trenches on Christmas 1914.
But gradually propaganda and the tabloid press made the Germans out to be monsters, and people took it in, believing the sensationalist lies and scandal about skewered babies and human bell-clappers. Then there was the concviction of British superiority, that we were bound to beat them as we were the greatest world power.
Very sad.