It's a losing battle, not worth fighting. And what you'll see, is that they'll all say "of course they're not perfect, you dumb-dumb, no one ever said they were" ... and then the next time you disagree about a particular player's expected performance, they'll whip out their 1-inch projection, and call you a dumb-dumb for not believing it, and for believing in your own assessment.
It's kinda like people sitting around guessing that 2+2=999, and then someone says 2+2 usually equals, on average, 998 and ... boom ... that guy is smarter! Let's listen to him! He was closest!
No, he's still a big stupidhead ... let's not listen to him.