it's not an anti-communist pejorative. it's an anti-authoritarian pejorative. but for you, it's the same, because you're an authoritarian who supports other authoritarians as long as they are red.
look, saying "all states are authoritarian" is something YOU assumed. you'd need to prove that first before we even get to anything else.
socailist thought, political parties, gatherings, etc, can all exist in liberal democracies. that's not the mark of authoritarianism.
i suspect you will say they exist to the extent that they are not a threat to the capitalists, but will be crushed if they were to actually gain power.
then i'd say you'd still need to prove that also, but first, how about getting a populace to actually vote for your views and win elections before crying foul.
whereas in an authoritarian state, straight to the gulag or shot. ie. Stalin, Mao, Kim, your heroes.