Anyone who's been on Lemmy for more than a month will either recognise exactly the group of users they're referring to, or themselves be part of the group. You're right to think they're attacking a group that you're part of, as you're the first person who'd come to most people's mind if asked to suggest an example of a user with those traits. You've also managed to contradict one of your earlier comments in this thread where you claimed the comment was against the entirety of leftist thought, as you've correctly deduced that they're not complaining about anarchist instances like db0 that don't describe themselves as Marxist-Leninist.