The one that gets me is when people use "a" with initialisms, e.g. "She drives a RV," just sounds off to me. she can do her thing but I drive an RV.
That said, I think the former might be more common these days, so arguably the rules might just differ between written an spoken English in some dialects.
That said, I think the former might be more common these days, so arguably the rules might just differ between written an spoken English in some dialects.