I'm curious. Would people who think he's a bully or creepy or hitting on the OP feel the same way if her neighbor were female?
OP, I would just be honest with him. You're busy, you're tired, you just want to come home and crash. If he keeps bugging you, then I would consider the creepy or hitting on you angles. But with just one interaction? He may just be trying to meet his neighbors.
Since I'm one who said he was hitting on her, I'll answer the bolded above. And my answer is that I simply cannot imagine a female using that approach.
he knocked on my door and wants to know if he has offended me in some way because I never want to "really talk." I was surprised and said no he hadn't offended me, I was just a quiet person. He said great, we should get to know each other sometime so I wouldn't be so shy around him, maybe have a beer sometime.
It's not very likely a female would say something like "have I offended you?" or suggest getting to know each other so that "you wouldn't be so shy around [her]".
So, if a female actually did approach me with that line, I wouldn't necessarily think she was hitting on me, but I'd wonder what she was about and probably would not be all that interested in pursuing a friendship with her. It's just not a natural opening for someone to use if they just want to be casual friends.
I did not say "bully" or "hitting on", but I did assume it was an attempt at flirtation - and a hamfisted one at that. It would depend on context whether it was creepy or not - I don't remember OP saying it was creepy, just that she was not interested.
I assumed it was flirtation, because people do flirt with each other. Discounting any gender-politics or whatever, people DO pursue each other romantically- there is nothing wrong with that, as long as they do it politely and civilly. People who are "putting themselves out there" to try to get someone's time and attention, are motivated by something. By the laws of zebra-identification, the most likely explanation for a man trying to get a woman's attention is that he is trying to flirt with her.
It's just normal human behavior.
His approach did not sound very appealing, and obviously it was not successful. Now, if OP was creeped out, or if he continues to be pushy when she has indicated she is not interested, then we have a problem. Most likely he is just lonely and not very good at making friends/getting dates (a self-perpetuating cycle).