The problem is not state socialism, it's the authoritarian side of it. Tankies promote authoritarian views similar to fascists but with a different economics view (not even that different some times), hence they prefer the dictatorships like USSR (in these days even Putin, which is idiotic), North Korea, China; over what they perceive as imperialist, the USA (I agree on calling it imperialistic and disliking it, but not on considering it worse than dictatorships).
I'm a communist which likes state socialism, but what is and was present in those dictatorship (ignoring the authoritarian side which I despise) is state capitalism.