I don't know if it was a derogative/pejorative? I always thought Jerry was just shorthand slang similar as Brit was to the British and Yanks to American's , Aus

I don't know if it was a derogative/pejorative? I always thought Jerry was just shorthand slang similar as Brit was to the British and Yanks to American's , Aussies to Australians ...even prior to WW2 (Germany -> Jerry) ?