Subject-Verb agreement with compound subjects

[Carol]

Geoff:
> > Hear, hear. Well said, sir!
> > 
> > The only problem now is that someone will start a discussion on
whether the only relevant English  "authorities" are those who speak 
UK English or US English.
 
> Potioncat:
> You're going to let the unwashed masses decide? Oh, dear.
> 
> Never mind UK vrs US, it'll be York vrs Cockney in the UK; Rural 
Southern vrs Urban Northern in the US---with a few other groups on 
both sides of the pond piping in with their choices. 
> 
> Grammar and pronunciation will go out the window--erm winder.
>
Carol responds:

Don't that beat all, y'all? Well, it don't make *me* no never mind!

Carol, recalling her days in No'Cahlina fondly but glad that
"Southern" is not the standard dialect for American English