This entire movie is intense. It deals with the subject of racial discrimination.. Most of the movie involves characters shouting at each other, because they are either stressed out or angry.
The Ku Klux Klan is brought up in a scene, and is likely to upset viewers. Gangs, gang violence, police violence, racism towards blacks, and racism towards whites are also discussed.
An incident involving a couple's son (Jamal), and what happened to him is a major part of the movie. Both protagonists (a black mom named Kendra, and a white dad named Scott) are deeply concerned for his well-being. It's also heavily implied that, while they do love each other, they are racist towards each other as well. It's also implied that they both are anti-religion.