Address someone's ignorance about a topic and suggest they use a search engine to educate themselves.
Ummmm, there's this neat little tool on the internet called Google.  It's fascinating really.  You can literally look up anything.....anything!  Since you obviously don't understand how U.S. elections work, type this into the little search bar thingy......."How do United States elections work?"  See I even did the work for you.  Copy and paste if you like, I don't mind.  Wait, do I need to explain copy and paste to you?  Crap, not enough time.  When you're done reading about U.S. elections and how they work maybe you'll think twice about posting nonsense about popular vote.