Reactionary? I think it would be a stretch. The only problem I see is that the user is angry and ends up contradicting themselves probably in haste because they went thermonuclear. They say imperialism is the primary contradiction then say:

You only need to read the Communist Manifesto and the ABCs of Communism to understand theory

This won’t teach you even a little bit what imperialism is. All you are gonna end up doing is probably using vulgar anti-Americanism as a heuristic to guess what it is.

They make some points in general about how discussion of theory is not important which are a bit odd. It is possible to engage too much in philosophical discussions but having some of it helps a lot in inproving our model of reality.

I think the user would be more reasonable if they were not agitated by the sub being called not socialist.