I will counter that counterargument: This is conspiracy theory nonsense. The entire thrust here is that viewers, as a whole, cannot be fair criticism of Snyder's work because the 'consensus' is that he sucks, is ridiiculous. There are a select few reviewers, like Arnold White, who specifically go out of their way to troll review, but they are in the vast minority.
The truth is, the vast majority of people, myself included, were 100% behind Man of Steel when it came out and thought it was a decent, if imperfect, beginning to the DCEU. And while I was definitely not 100% behind BvS, that one similarly had everyone hoping it would be good.
And what your describing doesn't really occur with other people. M Night Shalaman was a super star, until he started making movies that were awful, then people turned on him. Pixar was unstoppable, until they made cars which was questionable and then cars 2 which sucked. Meanwhile, after a set pattern of 3 DCEU movies bombing hard, both commercially and financially, Wonder Woman came out and got a lot of success of both kinds, with strong arguments backing why it's good. The consensus breaks all the time once a break in the pattern comes out. It doesn't necessarily mean you have to agree with the consensus, but when you ask, people articulate why they think the way they pretty often and thoroughly, and to write them off as drones who just want to cash in on the "lolol Snyder sucks amirite" bandwagon is pretty disingenuous.
So the idea that Snyder is going to be persecuted regardless of what he does is nonsense. We just want a good movie.