This is one of those movies that reminds you of the injustices rampaging through the world that we tend to dismiss or keep a blind eye on. The main idea is the alienation of the "others" - those who come from a different cultural background - in favor of the "locals". Here we see how in France a black is struggling to find a job and a place to live just because he's black - his education and his skills are often overlooked as, to the "locals" he's firstly labeled as black, all of his other traits (place of origin, cultural heritage, beliefs, profession, etc.) fall under this ethnic label. The same is with arabs - they're firstly arab, even if they been born in France or another European country and have lived their whole lives, perhaps they're even a 2nd or 3rd generation to live there - there's just a culture that isn't open to welcome there for who they are without putting an ethnic label on them first and basing everything off that one label.
In the movie we get to see these interactions and the gazes people throw at the black population in France, we can hear how seeing a black man with a white woman makes people uncomfortable and even bar-table theories about how in a 100 Africa will "occupy" France (figuratively, as in the African population is the future of France). The main protagonist, who we see calm and collected throughout the movie falls victim to this injustice on multiple levels - not only is he shunned from getting a job that would match his education and a comfortable apartment, but he's also broken physiologically - he starts losing it, and, with the most surreal experience movie experience I've encountered recently, he starts getting calls backs home from, what I assume, is nature - the indifference of the land he stepped on has caused him to hear ethnic drums, see signs that remind of unknown ethnic relics and urges to scream at the top of his lungs. To witness this is one thing, to explain it is different and I urge you to watch yourself to see how injustice can drive even the strongest of spirits mad.
