Would I be mean if I warn my friend her children (if they're boys) will be bald?

So I was having coffee with my friend yesterday and she said she could never be in a relationship with a bald guy because her dad is bald.

I kept my mouth shut but I wanted to say, "but that means your kids will be bald"

I personally don't think there is anything inherently wrong with baldness even though a lot of people do but I know she finds it distasteful so I didn't say anything. However, part of me thinks that I should of warned her that if she has boys, there is a chance she will end up being disappointed with how they turn out when they grow up.

What would have been the right thing to do.