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This is easy!
He may want to see where his food comes from.  That's reasonable to want that.  He might even find someone selling eggs that will accommodate him -- but that is not you.  If he really wants to know where his food comes from, he can raise his own birds.
The important point is this: you get to choose your customers.  It is his privilege, not his right, to buy from you.  If he is not savvy enough to build a rapport with you (that may eventually earn an invitation to your farm) then he is not worth your time.
You owe him very little in the way of explanation.  If he doesn't like what you're offering, he is not obligated to buy. But bullying you and verbally assaulting you is another thing entirely.
This I know from Craig's List, and this I know from raising and selling birds or eggs when I have excess:  I can be choosy with regards to whom I sell.  What I have is in demand.  If the tables were turned, I might suck it up and sell to the guy.  But as long as I have more people who want to buy my product than I have product to sell, I get to choose my customers -- and I will always choose nice, polite, and respectful customers.
And guess what happens as a result?  People get the message that they need to be polite!
I recently refused to allow someone to pay me $30 to clean the manure out of my coops!  How's that for being choosy!  (And a bit audacious having someone pay me for the "privilege" of cleaning my coops and keeping the manure.