Yes, infighting and purity-testing is fairly common left characteristic.
He basically sees AOC the same way you see him - grifter for power who refuses to actually fight on critical issues she campaigned on in Congress (healthcare, minimum wage, and so on).
What is the point of having progressives that say all the right words but then refuse to exercise their power when they can actually make a difference?
...sure, they'll claim that this time is different and it will not actually make a difference; obviously Jimmy disagrees.