They've just been a little... frustrated. Donnie's brother had been sick so due to all this he's really worried about him. Paolo... he's frustrated with dealing with Donnie's frustration. So they've resorted to yelling at each other.
[While she had to put up with it, but she wasn't going to make it worst by complaining.]
[video]
[While she had to put up with it, but she wasn't going to make it worst by complaining.]