Famous singers protect their ears too

I'm pretty sure he has or had tinnitus.
As you can see it's not the custom plugs singers have on stage to hear themselves singing only.
This is the basic and flashy foam earplugs.
It's the first time I see him wearing plugs in nightclubs tho
No reason to think earplugs aren't "cool"

EDIT: Fun fact, girls be like "so cute" / "so cool" when it's Bieber
