I wasn't aware that anyone hated him, mostly people are ambivalent/ don't feel either way.
Personally, he didn't really stick in my mind as much as other RIG NPCs so I never really felt anything about him either way. I don't think the Halloween thing helped his cause since his team lost(?) but they still won in the end, much salt, even though timeline (it was set in the past, and already knew the outcome)would be that Azrael would lose xd