It's literally not possible for one economic system to simultaneously "take over" the entire planet, so if a socialist or communist revolution ever took place there would absolutely be a first single country or group of countries to "go socialist." The USSR and its allies were, at the time of their existence and the height of their influence, recognized as being fundamentally communist in nature by communist scholars. Whatever deviations from that ideal caused them to fail are no greater in magnitude (or relevance) than the deviations current nation-states have from capitalism that libertarians use to No-True-Scottsman actually-existing-capitalism.

If communism 2.0 is a better system and wouldn't fail for the same reasons that the USSR did, then talk about those differences. When talking about communism 1.0 (and the many, many socialists/communists living today who basically have not deviated from the mindsets of the revolutionaries of the past), drop the special pleading and take the L.