"I didn't call you a bloody dumbass." T.J. snapped back. Not that she had never called him a bloody dumbass. She had. On numerous occasions. This was not one of them. "I just offered to help you. Maybe because I'm your friend and care about you." Because she was and she did. She and Tucker had been friends since first year. Whatever the reasons behind it he had to retake his OWLs. There were legitimate reasons to be concerned about his marks. If he did not care, she did  not care, but she did want him to know that she was there for him. She didn't intend to pressure him or berate him or anything. She had just wanted to offer. 

But He had snapped at her first, and T.J.'s fuse was anything but lengthy 

Hopping off the counter she moved to glare at him more effectively. "And even if I were calling you a bloody dumbass, which now I might be, it wouldn't be because I don't think you can get good marks. It would be because you're too stubborn to ask for help. And you think anyone offering it is insulting you." The parallels to T.J.'s own situation were ignored. "So you won't just fucking take help, when it could be helpful because you're a stupid, stubborn, stupid boy." She slammed the bowl of melted ice cream in to the counter, which made the liquid splash out, making a mess.  "Just fucking stop and ask directions!"