Patriotic Socialism, or PatSoc in short, is not a real thing, but libtards think it is for some reason. It emerged as a libtard pejorative against the most basic Marxist-Leninist principle of 'Socialist Patriotism.' The term was coined by liberals because it bares resemblance to 'National Socialism,' in an attempt to associate Infrared with Nazism. For many years, left-liberals discovered that if they call people who disagree with them Nazis, they will simply disappear. But this no longer works, which now explains their extreme butthurt.
'Socialist patriotism' is a core socialist value [1] which can literally be found in the textbooks issued to elementary school children in every Communist state in history.
p.380 Chatper 17, part 2: "Cosmopolitism and Not Patriotism Is the Ideology of the Imperialist Bourgeoisie"