The depiction of "others" is shown in Harry Potter through the term "Mudblood." This slur in the wizarding world is a derogatory term for a wizard who isn't of pureblood status.
Draco Malfoy calls Hermione this, in The Prisoner of Azkaban. This is highly offensive in the wizarding world.
Granger, you filthy Mudblood!
Hermione ends up punching Draco in the face out of retaliation.
POW!
HOW DARE YOU CALL HER THAT!
Harry Potter and the Deathly Hallows
Bellatrix tortures Hermione with the Cruciatis Curse just because she's born to Muggle parents. Hitler tortured the Jews just because of their race.
FILTHY MUDBLOOD SCUM!
She carves the word "Mudblood" into Hermione's hand so that she'll never forget what she's hated for being.