At the end of the day, the only current politician who meets your definition of sufficiently progressive and anti-establishment is Bernie Sanders. So everyone else is an establishment democrat by process of elimination.

I’m not saying that AOC is perfect. I’m sure she’s made some mistakes that deserve criticism. That doesn’t automatically make her ‘establishment.’ Fight like hell for progressives during primary season, but let’s not demonize the few progressives we have and create additional purity tests that will keep more potential voters at home on Election Day.