The whole ‘bernie bros’ voting red is a digital propaganda point started by t_d, and spun off into 3 different Bernie subreddits that coincidentally were all modded by people from t_d.
They worked tirelessly to flood facebook so it LOOKED like ‘bernie bros are gonna vote against their best interests in spite’.
I mean there were a few actual progressives that flip flopped but most of them voted Jill Stein.