When you see someone wearing a rosary as a necklace, do you desire to take this opportunity to find some way of passing judgment on that person?
Are you trying to find some reason to look down on that person, or to legitimize your intention to think that you are somehow better than that person? Or is it just another way to find something to hate?
That's not what rosaries are for.
I have a friend who wears his rosary as a necklace while he's doing yard work, because at some point, he likes to take a break, and sit under a tree and pray his rosary. Having it around his neck is an easy way of keeping it at hand, and it doesn't get damaged or broken by pulling it out of his pocket.
Just because one person wears a rosary doesn't mean everyone should wear one.
Wearing a rosary isn't necessarily a mark of holiness. But it can be a practical way of keeping one's rosary at hand and available for use in prayer.