I mean, aren't you saying that I haven't heard of "Not My President" because I am in an MSM bubble?
Doesn't that strike you as counterintuitive? I listen to a fair amount of MSNBC, CNN (and FOX) on my commute time. I've never heard "Not My President" mentioned on any of them. That's how inconsequential they are. I still don't exactly know whether they actually refuse to acknowledge that Trump won the election, or if they are saying that he's not their fault. It really doesn't matter because they are inconsequential.
Shit, at least Antifa makes the news, even though I do not think they represent the Left either. "Not My President" doesn't even move the news needle. I hardly think that is evidence that the Left hasn't accepted the outcome of the election.