Belz...
Fiend God
This type of argument, like Belz's "should they recognize all subgroups no matter how small", is quite frankly stupid. It takes problems with painfully intuitive solutions and pretends they are inscrutable in much the same way that "as-seen-on-TV" gadgets frame utterly common and mundane household tasks as if they are extremely difficult or complication-fraught for the average person, inventing a pressing need for whatever gimmicky junk is being peddled.
Except that in both cases, the infomercial and this, there is no problem to solve. The exaggerated nature of my comment, which should have been obvious by the inclusion of lefties and such, was meant to highlight this. My point, which I stated plainly, was not that we should name all of these tiny groups, but that we in fact shouldn't. Whether that means using "passengers" or "dudes" or keeping "ladies and gentlemen" is irrelevant.