WB messed up and it's their fault for choosing Synder to build up the DCEU. I personally thought he was a terrible choice and it all fell apart like I thought it would. Snyder is a Stylistic director like Micheal Bay, doing style over substance. But Synder tries to do style that mixes with substance but his work generally comes across as pretentious and acting smarter than it really is. This isn't how you should go about building a universe, you need to have a consistent plan that everyone is on board with. You can't just have a director go off and build whatever he wants and then say we will figure it all out as we go along.
As for the people celebrating his daughter's death, that's just awful. How good or bad you are perceived as a creative shouldn't lead to people being awful people to someone.