One reading in the Mass last night was from 2John. It includes, verse 7:
There are many deceivers at large in the world, refusing to acknowledge Jesus Christ as coming in human nature. They are the Deceiver; they are the Antichrist.
Talking with a friend later he said he had concluded that this verse refers to those people who refuse to acknowledge Jesus Christ as coming substantially in the eucharist.
How should I respond?