When Kel helps him he doesn't thank her instead he gets mad at her for helping him. It says in the book that Turning around after she locked up, she nearly tripped over Merric. He shoved her. "I didn't ask you to come bollocking in!" he yelled. "I don't need you to defend me!" Kel held up her hands and stepped back. "I didn't do it for you," she told him. "Now they'll give me all kinds of grief, saying I got a girl to...hunh?" Kel sighed. "I didn't do it for you, all right? I wanted to pick a fight with them and you were there, that's all." The noise was drawing other pages out of their rooms. "Just leave me alone!" Merric yelled, uncomfortably aware of their audience. He punched Kel in the left arm, then the right, as if daring her to hit back.
I think that Merric is rude because when Kel helps him, he never thanks her and he gets mad for helping him. I think that this is extremely rude because if someone helps you you are supposed to be thanking them instead of being rude. I think that if this was Kel I think that she would have thanked her.