Party Teaser

I was at a party with MS one evening where he got bored and started keeping track of the number of handshakes made by people. A person was called "odd person" if he made an odd number of handshakes, otherwise he was called "even person". After some time MS said to me, "Hey AD, do you know that there are an even number of odd persons?" I replied, "Big deal, MS. There will be always an even number of odd persons!" But still he seemed confused. Justify ...