Bio dad won in court today

I live in the south. My city only has male judges, most with southern “values”. My sons dad only just asked for some custody end of last year while my last name was still my maiden name. He also put in a request to change our sons last name to his. My son is almost 8 in a month. He’s a gifted kid in an all magnet school and also attends a school for gift kids once a week. He’s super smart. He also emotionally intelligent. Long story short, dad comes outta the blue (we’ve never had issues with sharing custody on our own and we’re never married) he’s just never chosen to be involved and any time he wanted to be, I always let it happen. But for 4 months after he was born he ghosted and then after that only saw him once a week on Sunday supervised. A lot of the times he’d be “sick” or had laundry going and couldn’t leave 🤣 let’s just all laugh at that excuse. His mom was the supervisor not me. Anyways I digress. I started dating a guy and my son loved him, real dad got jealous, decided he wanted custody rights. I got married, had another child. He now wants him to have his last name. Judge says today in court, no it doesn’t make sense but I believe in traditional naming and it’s common for children to carry dads name. I rule in favor of dad. I feel like this a garbage way to make a decision. Did not take into account age, mental age, what my son might want, how this affects him socially, emotionally, having to change his identity basically. Didn’t account for dad having ample amount of time to do this when he was younger. And that the timing is suspicious of right when I started dating my husband. It’s just not a fair way to rule. Old white men should not be allowed to make decisions based on their faith or how they were raised. It should be facts based. Having a stranger who doesn’t know us ask two questions and decide a life changing decision for my son with his own biases is so disheartening. I never stood a chance