Why do establishment Democrats get so triggered when a liberal criticizes the party? Is this tribalism boarding cultish behavior that anyone?

Cute now you know what Trump went through with the establishment of both parties.  His first 2 years he was trying to get the Republican establishment to actually do something other than just reforming taxes.  Soon, Biden will realize the same.

Because people leaving the cult is worse for the cult than outsiders insulting the cult. 

Because they believe we should all be conformists, like the Republicans!

It's also why no democrat has the balls to call out Trump's LIES directly! 

Because you said so ... this lib doesn't agree and consider your post a lib bashing rant violation. EDIT I did report it. The fact you think you're above the rules caused my diligence to act on my duty to self-regulate the forum. You're just blathering your opinion. Your inquiry is supposed to seek the unknown for you f/ us. You agreed to the TOS ... abide by them. Now I know your name, it gets closer scrutiny.

Do you have an example of this?  Which establishment Democrat?  What criticism?  It's hard to answer in the abstract.

I looked and you have a long list of questions and mostly anon answers.  No way I'm combing thru them all to find your example for you.  I tried a bit and found nothing.

It's called Groupthink, and yes, they demand their thralls to conform, it's a part of the groupthink method they are brainwashed by. 

Groupthink Symptoms

Type III: Pressures toward uniformity

Self-censorship of ideas that deviate from the apparent group consensus.

Illusions of unanimity among group members, silence is viewed as agreement.

Direct pressure to conform placed on any member who questions the group, couched in terms of "disloyalty"

Mindguards— self-appointed members who shield the group from dissenting information.

https://en.wikipedia.org/wiki/Groupthink#Symptoms

You sound as if something triggered you this morning.