The joy is in putting together the rebuttal - doing the research, writing and editing the position, clarifying your thoughts to yourself. That's likely the motivator instead of changing the minds of the trolls.
He should just create a notepad file, and make up an argument he can demolish.
Question: If globel wornimg is true ten how come antactuca haz ice?
Response: a wall of text about changing ocean temperature around Antarctica.
There. All the satisfaction of research without contributing to the forum takeover by awful trolls.