GR translation: a mean poem about the Leid-Stadt

[Mike Jing]

V644.31-36, P657.29-34   He is the pointsman. He is called that because he
throws the lever that changes the points. And we go to Happyville, instead
of to Pain City. Or “Der Leid-Stadt,” that’s what the Germans call it.
There is a mean poem about the Leid-Stadt, by a German man named Mr. Rilke.
But we will not read it, because we are going to Happyville.

In what sense is the word "mean" used here? Is it approbative or pejorative?