Bedtime Delay Tactics

Mom knows you have no legitimate reason to be out of bed, again, when the thing you urgently needed to do was tattle on your brother for saying, "Santa is fat." I said, "So. He is." She insists it's rude. I told her to hush up and go to sleep. Then Brian passes by her room and she tries the same trick on him. He said, "In some cultures you can call someone fat and it's perfectly acceptable. Now go to sleep." I think I hear her sniffling. What am I supposed to do about that?