Claire was clearly upset. The past events weren't something she was too happy about, now she just formed some sort of hatred for Dean.

"It's not fair, you know?" Claire said as he looked at you who made the mistake to try and reason with her. "Dean is a bad person! And Castiel just takes his side! He's just as bad."

She complained, looking at you. She doesn't know if she should expect you to be on her side or if you would even understand her, but she had the feeling you won't.