I see you choose to ignore centuries of sage advice not to engage in arguing with an idiot.
Proverbs provided man with the first advice in this regard.
Proverbs 14:7 Go from the presence of a foolish man, when thou perceivest not in him the lips of knowledge.
Proverbs 26:4 is perhaps more appropriate to your situation.
Answer not a fool according to his folly, lest thou also be like unto him.
This is just another way of saying that when you elect to argue with an idiot you run the risk at some point that the people listening will not be able to tell which of you is the idiot.
In today’s terms, the reason not to argue with an idiot is that the idiot will pull you down to his level and beat you with his vast experience at being the idiot.
All things considered, I feel you did a creditable job but I suggest you not pursue it further.
The reason I have done this (rightly or wrongly) is that so many people have completely disconnected Judaism from the Hebrew Bible. To them "Jews" are a progressive, downtrodden, free-thinking European minority group and the Israelites in the Bible are merely the forerunners of (lehavdil) the Spanish Inquisition and the KKK. Unfortunately, I can take only so much of this "Judaism says whatever contemporary liberalism says/Jews have never owned slaves" nonsense.
I apologize again and will endeavor to restrain myself in the future.
But the very next verse says, "Answer a fool according to his folly, lest he be wise in his own eyes." (Pro 26:5)