NOISE does not equal destructive force. Blow over bottle and see how loud a noise you can make, or next time you whistle tell me if your lips shear off or teeth snap from fatigue.......

there is no evidence that these vibrations are sufficient to cause any damage. You don't need much vibration to get fan blades to chop up sound. Tell him to go to his electric cooling fan in his house and yell into it. The sounds chops up. Now see if the fan comes loose and starts spinning around the room because he yelled into it