I'll agree with her about the supporters. My mother in law is a bernie bro if you will, and the group she goes with is honestly cult like. She has an attack for literally anyone on the democratic party that isn't bernie. I think bernie has good policies and would make a great candidate, but the level of hate and anger for other candidates that her and her friends have is honestly similar to my dad's blind support for trump.
It's probably more to do with Facebook and social media, and the way it creates teams that care more about an individual then actual politics, but I found it alarming last election when they created such a hatred over Hillary that when bernie was out of the race, they either voted Trump (becuase he pretended to care that bernie was unfairly treated by dnc) or didn't vote at all which led us to this predicament.
Anyhow, I think of voting bernie and it's his supporters that make me second guess, not him.