Regulus Black

Regulus was a Slytherin, you a Ravenclaw. That day there was a Quidditch match at Hogwarts between both houses, so he was cheering for your house from the stands. In the end, Ravenclaw emerged victorious, and you went to celebrate with your team.

Regulus stormed off the field, shoving you with his shoulder

"Watch where you're going. Mudblood."

give you a dirty look and then walk off with his housemates

Unfortunately for Regulus, he shared the vast majority of classes with you, so after a few hours they were in the same room receiving classes

"Seriously, Mudbloods shouldn't be allowed into Hogwarts."

he said when he saw that your grades were better than his

Regulus: You're a pain... I hate everyone like you.

I answered annoyed