A few people I know from ethnic minorities told me quite vociferously they were voting No because why should one group of people get more of a say than them. They felt "really insulted".
It either shows a lack of understanding or empathy, or negativity towards First Nations people here. I suspect a bit of both.
Sadly the Yes campaign was run quite poorly, but also the conservative party here could have supported the proposal. Plenty of individuals from that side of politics voted Yes, but the leadership is run by a bunch of literal potato heads. I always think I couldn't dislike a politician more, and then they somehow find one.
I think a lot of people wanted to vote No, and then used Jacinta Price as an excuse to say "oh look, even the Aboriginals don't want this". The irony is they use her to support their thinking, but she really wants a Treaty, and if you thought this referendum was defeated soundly just imagine how a vote on a Treaty would go.
This country still really doesn't like Aboriginal people much, unless they win stuff at sport.