Is this weird to put online

My brother went to court Friday. He was in a custody battle for his daughter who is less than 2 months old. Not only did the judge grant him full custody. The judge approved him to be able to move back to our state so he can be close to family. In the custody agreement the daughters mother will have to come here for her visitation. My brother is young. Starting off with that. He's only 22 but what he did seemed so weird and childish. He goes live on tiktok and says "My baby girl is coming home with me guys! My baby girl is coming. I won! We get to go home! I'm flying back to Minnesota and my baby girl is coming with me!"

Idk... Isn't this stuff you tell family. Why are we telling the Internet? Granted I'm happy he's coming home. I'm happy I get to be around my niece more. Just did this have to happen? Like... Weird and immature

Edit: I probably should have given more context but my brother is a very sensitive emotional person. He has TikTok and does take well to people saying bad things. I've seen him crash out over comments before. I've told him "Listen. I'm not saying this is right, but if you can't emotional handle people using something you care about to hurt you, don't put it out there. I know he loves his daughter. Mom is an awful disgusting person and my niece has so many health issues because of drugs and stuff she did while pregnant. I believe he deserves custody. However if he's too sensitive and can't handle some asshole telling him he's awful for taking a little baby away from her mother don't put it out there. That's kind of why I didn't think he should have posted that. He can't handle much because he's emotional and I told him don't give people ammo to hurt you.

Edit: For those saying I'm doing the same exact thing let me ask you something... What's my name? Brothers name? Nieces name? You don't know any of this and can't find it because it's anonymous. His stuff isn't