At this point, it's not Democrat vs Republican; most of us didn't hate our family or friends liking Bush, Romney, or McCain at even close to this level. Here's why I really think it's not exaggerating to call the red-hatters a cult: They follow a leader who has a lot of control over them and he can do and say no wrong. Overzealous dedication to 'dear leader' which leads to no thinking for themselves. Cults believe that only the cult leader knows the REAL truth and all people against him are false. The cult repeats slogans the leader says: "lock her up" - "build the wall." Cult leaders create enemies for the flock to obsess over (like Hillary, Ilhan Omar, foreign brown people, and former cult members who leave). https://youtu.be/SvwnIcCpF0Y
Also, in the case of this cult, he's feeding into the almost North Korea-level hyper-nationalism of his followers and promises MORE hyper-nationalism. He's now even giving the cult hope that HE actually won the election (REAL truth), in order to take their money (like Scientology).
There may be a few out there to whom Biden can do or say no wrong, and I will criticize that too (because I'm an independent). I will keep vigilant but I don't think Biden will create a cult like Trump; I promise I will call it out if it happens.
As for the Captain America 'hail Hydra' thing, I've seen a good amount of mutual Facebook friends finish conversations online with, Trump is my president, Trump 2020, and MAGA.