I once had a similar disagreement with someone on a public internet forum. Their statement wasn't wrong per se, because the factors we were arguing about were

I once had a similar disagreement with someone on a public internet forum. Their statement wasn't wrong per se, because the factors we were arguing about were based on a well defined mathematical relationship. I just thought they had the cause and effect relationship backwards. I put forth my best arguments but were unable to convince them. The same fate might befall you if you try to push this issue, although you have nothing to lose with a private communication.