Susan knows Janet likes when she complains, so she's got no issue hamming it up a little as she says, "He's got no respect or care for the ramifications of his actions. He was enabling her in scribbling all over the walls in the hallway! Clearly he's trying to indoctrinate her into his bad behavior."

She doesn't mention the secret training; Lancelot has mentioned that Magnus has ended the secret -- far too late, if you ask Susan! -- but she's still genuinely angry about it, and doesn't want to feel genuine anger when she's tangled up with Janet like this.