Arguing with an idiot can be time consuming and mentally draining. Arguing with an idiot is a lot like a saying my dad used to tell me, "Never wrestle with a pig, you'll both get dirty and the pig will enjoy it." In other words, don't argue with an idiot, you both look stupid and the idiot enjoys it!
So, consider the overall need for such a discussion. If the outcome you are seeking is not extremely valuable, break off the discussion sooner versus later. You'll save your brain cells, your mental sanity, and the strength to fight another day... and everything will be right with the world.
OK, but what about