How do I get my otherwise hypercool older brother in law to stop wearing his Bluetooth earset constantly?

Fritz.

What a dude.

Totally about who you know.

Got his Mercedes Benz by trading a certain number of cases of a certain wine he had.

Totally easygoing. He lives in a stress vacuum.

But he wears his Bluetoothway too much. Such items should be like neckties. Take it all the way off if you’re not using it.

It makes him look a tool, which I know he totally isn’t.

How do I get him to stop without offending him?