Let's reframe... you came over, took a shit on my lawn, proceeding to tell me how my yard stinks.
I have no need to defend "my position," because I was never posing any beliefs nor attempting to persuade anyone of anything.
If you want to start genuine conversations, opening by discrediting their work and insinuating they're a moron and fool - according to the frame you have constructed - is probably not the most effective way to begin.
And now, you get to bow out convinced of your own righteousness. No need to further defend, since you're obviously right.
✌