Are you kidding? The DCEU by far is the most hated not only superhero movie franchise, but the most hated movie franchise of the last decade or so, period. Only the Star Wars prequels come anywhere close. The MCU is put on a pedestal by the vast majority of the internet, let's not act like the vocal minority here and there means there's any real hatred for it.
Ask yourself who's the most hated superhero movie director? Answer, Zack Snyder (hated mainly for his DCEU films).
What's the most hated superhero movie? Answer, Batman v Superman: Dawn of Justice (DCEU) Followed very closely by Suicide Squad (DCEU).
Most controversial and mocked scene? Martha scene in BvS (DCEU)
Most hated superhero movie performance? Any one of the following: Jared Leto in Suicide Squad, Henry Cavill in Man of Steel and BvS, Ben Affleck in Justice League, or Jessie Eisenberg in BvS. All are DCEU movies.
Think of the way the majority of the internet leapt to James Gunn's defense when his controversial tweets resurfaced. I know for a fact of it was Zack Snyder in his place that wouldn't have happened. There's no contest, whether It's deserved or not the DCEU is far more hated then the fawned over MCU.