Basically, be as harsh as an a villain group as you want. I'll start it off with an example
Malta: Look at that big, juicy endurance bar...
Circle of Thorns: Stop trying to copy Avatar: The Last Airbender
...among others. Have fun! :D
Tsoo: All east Asian people are ninjas... right?
Rogue Island Police: #NoLivesMatter
Nemesis: Prussia doesn't exist anymore, damn it! ...Or does it?
Hellions: Hey dudes, wouldn't it, like, be cool to get demon-powers?
Vazhilok: Doctor, Walking Dead just got cancelled! 'NOT ON MY WATCH!'
Warriors: 'Screw you all, 'The Warriors' is a classic movie!'
5th Column: SIG HEIL!
Council: Sig Heil this, idiots.
Carnival of Shadows: Watch as I pull your innards from this hat!
Sky Raiders: The Captain Hammer of supervillain groups.
Outcasts: Well at least we aren't the Skulz.
Trolls: Hey buddy, can you spare a 'dine.
Crey: Because Enron, Nestle, and Comcast can't hog all the evil.
The Freakshow: Extream body modification meets BattleBots.
Devouring Earth: Mother Nature wishes she'd had an abortion.
The Family: Trying to be The Godfather, but ending up more like an Olive Garden commercial.
Red Caps: Homicidal lawn ornaments.