Originally Posted by
SiegePerilous02
There is also the fact that Snyder's film was being hyped up as an event because it was bringing DC's two biggest characters together to the big screen for the first time, something people have been waiting for decades for. It landed with the biggest possible, embarrassing thud. And it was in the middle of the post-MCU new era of superhero cinema, whereas WB's other bombs aside from GL (who is nearly as big of a character) were well before hand.
Going into appreciation threads to bash the films is a dick move, but otherwise it's not surprising people who are invested in the characters still criticize it. It may subside a bit more after The Batman comes out, but even then we may get non-flattering comparisons made towards Affleck if it is well received. This will go doubly for Superman if/when we get a new take for him as well.