Tell the person to use a little common sense. When has counting ever been stopped at approximately 11pm across multiple states, all at the same time, with one candidate up big; only to then get restarted in the morning and see a statistically impossible swing in votes towards the other candidate in all the same states. And it wasn't the entire states either, it was specific counties.
That's just the tip.
Anyone who dismisses voter fraud as conspiracy theory isn't worth the air they breathe. Just move on.