This is a weak argument. The reason for the electoral college, like so many things laid out in the constitution, is to provide checks and balances, int his case on the larger states. It's not about counties. It's about holding back "the violence of factions" frequently mentioned in the federalist papers.
That said, the electoral college does need reform. I would prefer that the winner of each state get two electors and then have the rest be proportionally distributed. That would provide greater incentives to vote in safely red and blue states. Perhaps the Cruz supporters down in Texas who didn't show up to vote for Trump would have done so reluctantly if they thought their votes actually mattered in stopping Clinton and the same goes for all those anti-Trump protesters in Portland and elsewhere who didn't even vote.
