Of course, that's why I asked for your e-mail address. I will send you units of nothing. But you insist on getting them via the Bitcoin system instead of the e-mail system. So, do you want the units or will you keep insisting on the system?
I don't think you're that stupid you don't know the difference. You're just choosing to act ignorant.
He has every right to prefer a specific system or medium of exchange for the transaction. All financial transactions generally follow established protocols. There's some flexibility in choosing a method the recipient accepts as valid, but still within the parameters set by the recipient. For example, you can enter a store and choose to pay by cash or card, but you cannot take the goods and tell the cashier "I will send you units of money via carrier pigeon" and expect him to accept such a transaction. But, if you persist in using a carrier pigeon instead of the preferred method, it raises concerns. It could be that you don't have the units readily available, or maybe you're simply trying to scam.