Goyle's statement that he'd been friends with his classmates before school wasn't lost on Marietta. She knew that many Slytherins held tight to their connections. It was something she knew was unlikely to disappear with the end of the war but like most had hoped that eventually such things could and would be forgotten.
"Enjoy the rest of your day," she gave a nod and turned her attention back to the display so as to allow him to exit as he had stated he ought.