not to mention that the whole "subjective truth is the only truth there is" smacks of "if we can't be right, then no one can"...but then we can all agree in our false moral position against oppression, and then it's like the actual conditions that support it don't exist! Okay, maybe that last is a little extreme, but seriously, that sounds like where their argument is going, to me.

Everyone's experience is, yes, subjective, but truth...not so much. And that's the problem of reaching objective truth, not its nonexistence. In my opinion.