My teenager says taking down a video would make the whole thing weird

My fifteen-year-old posted a video of her nine-year-old brother doing an elaborate dance in our living room. He was wearing a cape made from a beach towel and introducing himself with a name he invented.

It was funny. We laughed when he did it. He even asked her to film the second attempt because the towel fell off in the first one.

He didn't ask her to post it.

A friend mentioned seeing the video, and now he wants it taken down. My daughter says it was up all weekend, people already saw it, and deleting it will make him seem embarrassed about something that wasn't embarrassing until he made a big deal of it.

She also says he knew she was recording. That part is true. It just doesn't answer the part he's upset about.

I asked her to remove it. She said she'd make the account setting more restricted instead. He said he wants it gone, not shared with a smaller group. Then she told him he needed to stop asking because she was handling it.

I dislike how quickly his objection became something she gets to manage for him.

At the same time, I don't want to give a dramatic lecture about the internet that turns a fairly ordinary sibling disagreement into a catastrophe. Nobody has threatened him. I don't know who saved anything, and I won't pretend I do. The decision in front of us is about the copy she controls.

She thinks I'm suddenly inventing a rule after liking the performance myself. I can see why she feels accused. I didn't ask where the video would go when she filmed it. Our family has been casual about taking pictures, and apparently we've all been filling in different assumptions.

I want a household agreement that works when either child is holding the phone. Being allowed to record a goofy moment shouldn't automatically mean being allowed to choose its audience. But I also need a way to explain that without making her feel that every photo is a permission form.

Would you deal with this video first and discuss future sharing separately? Or would you have both kids agree on the rule before requiring her to take it down? His request feels clear to me. I'm less clear about how to avoid turning the rule into another argument about who is being unreasonable.