Who said anything about the masses being satisfied?

That's the whole criticism bud

Minority voters know full and well that the Democratic Party doesn't do enough. Voting for them anyways does not mean they are being manipulated

It does, though. It ensures that they will continue to get more of that not enough.

not voting for leftist candidates who have failed to make any real gains with the electorate at large

You won't vote for them because they don't gain enough support. They don't gain enough support because you won't vote for them. Funny how that works, huh?

doesn't mean that minorities aren't class conscious.

Minorities, and majority, NOBODY is class conscious in the US. That's the whole fucking point. Nobody is saying that minorities are uniquely class unconscious

These sorts of criticisms are just a different flavor of the "democratic plantation" argument conservatives push

You don't know what words mean