Really? :huh .. From what i can read it is just a quiet person or object.. Being a quiet man.. Being a quieter.. Well anyway.. You probably know better..
A manager is someone who manages, not someone who's managed. Hence, a quieter is a person who quiets, not someone who themselves is quiet. Or something like that.
At any rate, I don't think any man, woman or child should be denigrated for their lack of vocal fortitude in today's society.