Prejudice In The Sorcerer's Stone

Prejudice is a major topic of the Harry Potter series. Lord Voldemort, the main villain, is introduced in The Sorcerer’s Stone as a wizard equivalent to Hitler, looking down on anyone who is not of a “pureblood” status. He is hostile to muggles and muggleborns because of his witch mother’s abandonment by his muggle father. The expressions "pure-blood," "half-blood," and "Muggle-born" have been coined by people to whom these distinctions matter (the upper-class purebloods) and expresses their prejudices. They treat creatures they feel inferior to themselves - the beasts, outcasts, or slaves - as second-class to human wizards.
The Sorcerer’s Stone introduces the human part of wizard prejudice when Malfoy explains that “some wizarding families

At the beginning of the book the portrait of Sirius’ Mother starts to yell “Filth! Scum! By-products of dirt and vileness! Half-breeds, mutants, freaks, begone from this place! How dare you befoul the house of my fathers?!” indicating that purebloods do not just look down upon muggles, but any being that is not a pureblood wizard. Later on in The Order of the Phoenix, the sorting hat gives the school a warning against the houses being divided in “this troubled time”. This idea is enhanced when Hermione repeats Dumbledore’s words from the previous year: “Lord Voldemort’s gift for spreading discord and enmity is very great. We can fight it only by showing an equally strong bond of friendship and trust. Differences of habit and language are nothing at all if our aims are identical and our hearts are open.” This statement is in direct contrast to Umbridge, a Ministry spy who has helped instigate her prejudiced views through legislative laws against the werewolves, centaurs, etc. Throughout the book many prejudices are carried out in cruel ways, both directly through Umbridge and indirectly through ignorance &

Karma affects both the good and bad sides.
Hagrid, who is a half-giant, is slandered and mistrusted by Umbridge. Because Giants have violent natures, they have been nearly eradicated by the ministry and the few survivors left have gone into hiding in the mountains. Therefore, Umbridge fired Hagrid and sent five Ministry of Magic officials in case force was needed to subdue the “dangerous” and “filthy half-breed”.
Centaurs are highly intelligent, but do not wish to mingle with humans to be “servants or playthings” become angry when their territory is restricted by the Ministry. So when Umbridge was confronted by a herd of centaurs in the Forbidden Forest, she insulted them with racial slurs and her Ministry arrogance. After Umbridge attacked one of the centaurs near her, she was taken and nearly killed by them, however Dumbledore saved her