First point, BvS is a bad movie (even the best filmmakers have their misfires, so it's understandable that it would happen, and, sadly with Snyder, it happened to him at a point when the survival of the Snyderverse needed a win to keep going forward). One can think that Snyder's vision was one of the key mistakes in the early DCEU without making it a personal attack on the people involved.
So far as moving on from the Snyderverse after WB decided to take another path, there is a point where you've said your piece and it is time to let things rest. Also, bear in mind much of this was at a time when WB was consistent on the point that it wasn't happening. At what point do you say: "I don't agree, but understand"?
Also, while the Snyder cult did earn itself a toxic reputation, I don't recall Snyder himself being demonized as a terrible human being, just not considered a good DC filmmaker. Personally, I did feel his continued campaigning for the Snyder Cut came across as entitled, but I don't know the guy personally, so I will concede that that may not be a fair assessment. It does really feel like, in retrospect, that he was using the Snyder cult to get the movie made (including turning a blind eye to the toxicity until after everything was finished), but I don't have enough evidence to prove such a claim.
Good for you and him.
Yeah, maybe leaving Randolph out of it would be better for credibility's sake. As for the Snyder Cut being excellent filmmaking, I have noticed that the editing has gotten consistent criticism and there is some question as to whether the movie is good on it's own terms or good in comparison to Whedon's take (interesting questions, sure). Kinda wonder if YouTuber Bob Chipman hit it on the head, that the Snyder Cut being "good" or "bad" isn't really the point and that it's mere existence is really the only thing that matters in the final assessment, if that makes any sense.
The Snyder Cut got made, reviews were generally decent (esp. considering most of us where expecting it would be laughed off the service), causal viewers were positive, and Snyder got to end his DCEU run on his own terms instead of his legacy being "Martha" and a Frankenstein-ed bastardization of his last project. That's better than many filmmakers and films that weren't appreciated in their time got.
Frankly, I've found the Snyder Cut to be worse then Trekkies, if only that the entitled and toxic Trekkies seem to just wallow in their grievances instead of harassing people (although the guy who runs that Ex Astis Scientia website has sure gone downhill with his "Discovery is not real Star Trek or canon" hissy fits). Honestly, never seen the MCU fans you're describing (and if it's okay for Snyder cultists to want the Snyder Cut released and for the DCEU be put back into the Snyderverse, it stands to reason that it's okay for MCU fans to want to see other Marvel properties in the MCU, so long as they're civil about it). The Snyder Cut seems to be moving in the vein of They Who Must Not Be Named and the Fandom Menace. I actually thought they were more along the lines of the "Star Wars Give Us Legends" crowd, but they seem to be moving out of that zone (not to mention that the Legends movement is pretty dead, save for a few internet social hubs where people put on their rose-colored glasses to remember when Star Wars was great.
So that's why they're copying They Who Must Not Be Name's attempts to review bomb Captain Marvel to send a message to the studio to pander to their demands? And harassing the company and employees who own the IP?
You're not entitled because you want more Snyderverse movies; you're entitled because you're throwing a temper tantrum over WB said "no" -- esp. since everyone from them to Snyder said from the very beginning that the Snyder Cut was a one-time deal.