I would say that he's trying to impose an arbitrarily stricter standard than the conversation implied. That's one way you can accuse your opponent of being wrong when they're not strictly wrong.
Finally, someone gets what I've been trying to get across. Careful, you may be accused of policing the forum now...
Still find it weird using the word "opponent" when it comes to what should amount to a "conversation".
Must be that seasonal affective disorder making everyone adversarial.