My pick is Five Finger Death Punch and the obvious answer is Ivan Moody. The guy radiates that alpha-male wannabe energy and it definitely rings through all of the songs he has written and performed with this band. The guy is just a prick and a self-victimizing asshole.
I think he’s the primary reason FFDP is mocked so badly.
He stole riffs?
Indeed he did. Years ago, they were holding auditions in my area for a new guitarist after Wes Borland left. They asked people to demo stuff they had written, rather than try to play along with their current songs. After auditions wrapped, they didn’t pick anyone and life went on.
Cut to a few months later when their next album dropped. The local rock station that helped sponsor the audition starts getting numerous calls from people saying the material they demoed during the audition got incorporated into songs from the new album. No credit or compensation was given to any of them. From that point on, the radio station rightfully blacklisted them.