Princes v.s Kings

Eugene isn't the best example for this

As shown by King Felipe of Belgium

This is BEARD

Either way they're both royalty.

Damnit prince Adam. Don't make the rest of us Adams look bad. Grow your damn beard already

Technically Eugene has facial hair

Children have a natural aversion to facial hair

But not all who have facial hair are kings.
Mostly, it's just sissies who are desperate to appear manly somehow.