I usually reply in very articulate cohearant well thought out statements.....
carefully pointing out any errors they make or any misconceptions they may suffer from.....

One person the other day said "speak in english that is the land the game comes from"

I asked him where the land of "english" is as I was under the impression that the game was developed in the United States.....

He made some remark about me being a china farmer and put me on ignore.....

Problem Solved