Provocative psychological drama

Peoples of differing ethnicities and social-economic levels 'crash' into each other in Los Angeles over a day or so at Christmas time. These people include:

A white cop who's angry over the downside of affirmative action and so abuses his authority (Matt Dillon); his young white partner who objects to the abuse and actively tries to counteract it (Ryan Phillipe); a black TV director who feels emasculated over the racism he experiences and ultimately blows up (Terrence Howard); his light-skinned wife who doesn't know when to shutteth up (Thandie Newto... läs resten.