Mr White, here's some common sense: Your client wants a sanctioned right to insult the Catholic faith by appropriating one of its most sacred symbols as a fashion accessory. Far from this being an expression of speech or of religion, I doubt whether this punk is capable of articulating or even conceiving a coherent religious thought.
The kid is wearing the Rosary in memorial to his brother - who was wearing this same Rosary when he died. If you consider that to be merely a fashion statement - then you have no initiating conversations about common sense.
Certainly that position is not in line with any Catholic teaching I have ever come across.