We'll, we're either supposed to like the movies, or we're "fanboys of a rival studio" or hating on it because it's the cool thing to do. There's no justifiable reason to dislike the franchise, apparently.
This.
Now, the movies did stink (Batman vs. Superman especially), but the DCEU films certainly get a heaping amount of hatred in them to where you can't say anything remotely GOOD about Justice League without having to begin by admitting in a joking manner that it wasn't that good to begin with.