AITA for demanding my friend take down his video of my daughter?

We have a lakehouse and spent some time there over Christmas with some family and friends. One of the things my daughter did was learn to wakeboard/snowboard. She failed a bunch of times but our friend recorded her first successful ride and posted it with the caption "First time wakeboarding!" In the video, as she falls you can see her entire butt. <br><br>I saw the video and told him to take it down. He said she's just a kid, it's innocent, and it's not a big deal. I said that isn't okay, she has a brother and he would not want a video of his entire butt posted either. He laughed about it and said ok but hasn't taken it down yet.