@AnarchoNinaWrites
You're never going to argue someone down off a position, directly.
The absolute best, and this is terribly rare, is if you make a good point, and walk away, and *period of time* later they suddenly realize 'fuck, they were completely right'.
If you want that goal, try to think of a memorable, pithy, well phrased and persuasive point. If you don't have one yet, don't bother to reply. There will be another nazi later. Time your bon mot and leave it as an emotional landmine