Good on these fellas (if that's what they are) for letting the company know that they're not going to get away with dictating to the uniformed staff what accessories they can and cannot wear.
More than that what a simple way to let 'some' of the cabin crew know what you might be up for later when the lights go out!
To be fair if the earring wearer is the African guy then that might not be what he's looking out for.