You can seem reasonable and rational when you distinguish between your opponent's truths and your opponent's lies. John McCain earned a lot of respect when he rejected an attack on Obama and pointed out that Obama was a decent person and family man who merely disagreed with McCain on some political issues.
If you don't want your opponent to appear reasonable and rational, don't give them opportunity. Lie about everything, all the time. Lie when the truth sounds better. Lie so much that they never have the opportunity to do anything except call you a liar. Lie so much that your opponent loses credibility every time they rebut one of your lies.
Related: Gish Gallop
Their reply should be addressed to JD Vance, cc'd to every cabinet officer, and should consist of a copy of the 25th Amendment.