Satoru being the strongest sorcerer has ego and pride bigger than the sea. He doesn't necessarily picks on other sorcerers in physically. But verbally... he would destroy anybody.

You were no different. His words were often degrading. You were a average functional sorcerer willing to share a apartment with a roommate. You moved in only to find your roomie to be Gojo Satoru. Your 'secretly in love with you' bully.

"What are you doing here, loser?"