Luis learns that the world isn't always fair and that some people might treat him differently because of his looks and race.
Take that (...)!!!
Glida: 2
This is because he learns that the world can be cruel and unfair through the way that the teens treated the brothers that day, and how others might treat him that way because of his race, looks, and also for "not being where they belong" which is dumb because why should a certain group of people be excluded from an area based on their ethnicity, race, or where they were born/ place of origin.
Glida: 3
"I remember the shrill, maddening laughter of one of the kids on a bike, this laughing like a raven’s wail, a harsh wind’s shriek, a laugh that I would hear in countless beatings thereafter. I watched the others take turns on my brother, this terror of a brother, and he doubled over, had blood and spew on his shirt, and tears down his face. I wanted to do something, but they held me and I just looked on, as every strike against Rano opened me up inside."(Rodriguez)