The Brief: The phrase "Woke up and chose violence" refers to someone who is causing chaos in a particular setting.

DEEP DIVE
The phrase “woke up and chose violence” or “wake up and choose violence” is used often on Twitter. It typically refers to someone who has done something savage, like being brutally honest or trolling people. It also refers to those who cause chaos on social media or in a social setting. The phrase is meant to be funny, not to refer to actual violence.
Miss Warwick woke up today and chose violence and I’m here for it
— Adeloncé (@QueenAdelonce) December 6, 2020
The horse woke up and chose violence https://t.co/PPZTSPKf4A
— ✨ (@whor3abIe) December 4, 2020