Snape was not very popular in his childhood days, so having a powerful friend like Lucius on his side must have been a great bonus to prove his worth to the Dark lord (Voldemort). 3) Snape's hatred towards Harry made him partial towards Malfoy (who is under his house Slytherin). read more
Because Draco Malfoy belongs to Slytherin house. This is perhaps the most obvious reason why Snape is partial to Draco and the rest of the Slytherins. Snape, as head of the house, evidently cares and values his students among all others. "Settle down, settle down," said Professor Snape idly. read more