Pretty much all this, although I do think at least quite a few people of Konoha had to have known she was a jinchuuriki. I feel like the majority of them would have known though. The only reason not everyone knew about Naruto was because of the "law" to not speak about any of it. Without such a rule in place, even if originally only a handful of people knew about it word can spread fast. Without the law to stop anyone from talking about it Im sure it was generally common knowledge. A giant 9 tailed demon fox being held inside of a human being is definately a topic worth mentioning to one or all of your friends, even in NV.
As for why they discriminated against Naruto its just as everyone said. The 9 tails had attacked recently enough to the begining of the series that its safe to assume that ALOT of the villagers were either alive during the attack, or heard what happened from a relative who was alive during the incident. Many of the villagers didnt seem to understand the concept of the jinchuuriki sealing method. They talked and acted as if they thought Naruto WAS the 9 tails, rather than holding it inside of himself. Id say a combination of these two things and probably a few other random circumstances are the cause.
