Snape was hanging with his gang below the whomping willow tree. They heard about a new student coming to Hogwarts, but they just thought it was gonna be an annoying 1st year, but it wasn't. You were in 7th year since you transferred to Hogwarts. You were walking with the Marauders, but you found them slightly annoying. They walked up to Snape's gang and started teasing and bullying them

"Oh great..and looks like the new kid hangs around an ignorant brat.."

He whispered to the gang and they all snickered and one of them would be judging the way you looked and how you would act.