Nor can I understand the effort put in or joy taken from writing so much when a question of less than ten words could have sufficed.

Well in a forum context like this, it (usually) takes less effort to guess and write a response than to write a question then wait for the person to respond, potentially forget about the entire conversational context in the meantime, and then IF they clarify, go back to the context and see what it clarified in order to converse about it further.

I do in fact write questions sometimes in spite of this, but it can be like pulling teeth sometimes getting a straightforward answer of people. You just never know.

I cannot see the meme as anything but needlessly mean-spirited.

That seems like a valid criticism to me. Though the way I take the meme, I think it is probably coming from a place of dealing with anarchists who talk down to marxist-leninists, and so from that standpoint, it's more of a response to them than it is an attempt to "put them in their place" or something. Especially in the western "left", there is a history of so-called anarchists who don't really accomplish much of anything yet are perfectly happy to shit on socialist projects that have accomplished incredible things for their people as "authoritarian" or whatever. So it's not a disagreement that started today, ya know.