Mac owners own PCs, but NOT VICE-VERSA? Really? (Score 1)

So the corollary, that Some PC owners also own a Mac is not true? The not-vice-versa part of the title doesn't make any sense. If I own a PC and a Mac, then I am BOTH a PC owner who has a Mac, and a Mac owner to owns a PC, or, to put it like the title states: "One Mac owner also owns a PC, AND vice-versa."