Shouldn't laugh at either. Hair loss is a genuine source of anxiety for men. I think we should genuinely be more vocal about not making fun of that as men.
Hey man, I know personally how terrible it is for a man to go bald, but trust me. The sooner you accept it and learn to laugh about it, the better.
Or save up for a hair transplant, they can be pretty cheap, especially if you have the chance to travel.
I'm not saying that we should be ok with people being assholes, but the only thing you can and should control about this situation is how YOU feel about it, not what other think. I've had plenty of bald friends who had zero issues getting girls (or guys, but let's be honest, that's like playing on level Easy+) and there's plenty of successful bald people.
This is in general, when it comes to anxiety, something I know really well. It's inside of you, changing the world to eradicate or reduce what causes you anxiety is an impossible task. But you can learn and control how you react to your feelings and eventually control them. That's the only sustainable way to survive in the long run. CBT and meditation helped me a lot.