MN jury please confirm me in my righteous indignation 
:
I'm a uni lecturer and a while back I had a piece of software developed to support our students' learning. As this software could be helpful to anyone studying the same subject, we made it free and downloadable to the public from our university's website.
Recently I was contacted over email by a member of the public enquiring about this software. I pointed him to the download link, but he replied saying that he only had access to a PC provided by his work and he didn't have access to download programmes, though he could install software from CDs etc. So in a gesture of goodwill I said if he could send me a CD and a postage-paid return envelope I'd download it onto a CD and post it back to him. This was less than a week ago.
Today he contacts me saying he's been checking his post daily and nothing from me yet. I replied to say sorry, I'd been working away from the office for a couple of days and hadn't picked up my mail yet but I would get onto it tomorrow. He replies saying can I send it soon as he wants to get started by the weekend.
Now, had he just said something like 'fine, no worries, hear from you soon', I'd have left it but his second chasing email got my back up so I replied to say I'd try my best but hope he could understand I had to prioritise my normal duties. He then emailed back offering to pay for the software, which is beside the point as it is free and paying me wouldn't make me able to do it any faster. So I thanked him for the offer but explained that paying for it wasn't an option, it was just that I didn't appreciate being hassled when I was doing him a favour and didn't have to offer.
He's just replied to say that as I offered, and he didn't ask me to do this, he is entitled to ask when he can expect to receive the software. Yes, once, fair enough, but not pester. Anyway I've stopped engaging but I'm peeved, I tell you, peeved, so I thought I'd come and rant here instead.
So AIBU or does he have the manners of a slug?