What did he mean by this?

Everybody type in the chat Lassalle is a jewish nigger!

i read that as "after debating a diaper wearing sophist ancap" and i think thats funnier

Karl Marx, if alive today, would have been a Holla Forums poster

marxmyths.org/maximilien-rubel/article.htm
He didn't want his theory to become some rigid set of beliefs but a living, always changing tool of the proletariat in their struggle against capital.

posts like this make me feel sick

he's right though
also, Holla Forums stands for Holla Forumsolsheviks

That Lasalle was an ugly-ass Jewish nigger in addition to being a bad theorist.

but what did he mean by this?

"Marxism was a mistake"

Pseudo-Marxists and neo-Marxism was already a thing in his lifetime.