I don't think people would've gotten mad if he didn't go around insulting leftists for liking catgirls, calling them infantile or even denigrated anime-liking or furry comrades for "partaking" in, quote-unquote, "non-beneficial and even harmful activities".

This guy acted as if revolutionaries were all perfect little angels sent by God who never as much as done "non-beneficial" or "non-harmful" activities and always dedicated their lives into spreading socialism and only doing "beneficial" activities. Like I mentioned previously, Stalin passed on the boof many times in the past, Che/Fidel smoked cigars and Engels drew art that could be considered pornography to some (as example, does the nude art of her wife come to mind?).