I don't know how much is being made up but it's definitely being framed like what a surprise from them Bernie bros. A lot of shyt is written to make people be completely defensive about everything instead of allowing any real constructive discussion. Kinda forces people to be that way when for 3 years, its been a whole lot of bullshyt from Democrats (folks on twitter not elected officials) and folks in the media spitting in the face of anyone who supports Bernie. A good amount of elected Democrats have adopted a lot of the platform and posturing as progressive and expect ppl to buy it like their records don't exist and as fans of theirs do nothing but insult Bernie supporters.
The whole Beto fiasco illustrates a lot cuz a lot of these folks really expect people to buy some of these candidates when we saw what happened w/ Obama (which was more of a perceived triangulation due to his style of campaigning) and can't help but expect the same from a good majority of the field. Who really expects em to not bow down to the big donors and not back down from Medicare For All or a Green New Deal.