Arguments included:

"If you don't know, say no" Incredibly reductionist, could be used to justify any position, but a very effective soundbite. It's only when you extrapolate it, that you realise the issues. Imagine if someone told you "If you don't know whether a girl/boy will say yes to you, never ask them out on a date". Uncertainty is an inherent part of most of human nature. A lot less humans would be born if no one had the presence of mind to find out more about whether a person liked them, or just took a gamble and asked for a date.

"This will allow aboriginals to claim and take your land" Because Australia was declared "terra nullus" on 'discovery', and therefore regarded as uninhabited under English law, colonisers basically took and claimed all the land and dispossesed the Native Australians. And ever since, there's been a resistance to recognising prior ownership and use by native Australians, because that might threaten current ownership of land. No one wants land and property they own to be arbitrarily taken away from them with no recompense (ironic, yes?), so it's very easy to create fear in current landowning/propertyowning Australians by saying increased recognition of indigenous Australians in any form could have their land taken from them and given back to indigenous Australians.

"This will be a 3rd chamber of parliament" There are currently two houses of Parliament of government, in which candidates are voted and elected by a majority of their constituents. The houses form the core mechanics of how laws are created, debated and enacted. By portraying the proposed advisory body as a 3rd legislative body on par with the 2 existing houses, and pointing out the body was to be formed from indigenous Australians, the no campaign capitalised on fears of changing our entire political system, and the false impression of giving indigenous Australians incredibly disproportionste and unfair weighting within the political system.

"Enshrining a specific 'political' body made up of only indigenous Australians in the constitution makes us unequal, because they don't do that for other Australians". This one tries to capitalise on feelings of equality, and therefore fairness. Because I don't get X, they shouldn't have X. And neatly creates the assumption that the status quo is equal, so why change it. Ignoring that indigenous Australians are a very small percent of population, and therefore less than 5% or so of the voting population, so unlikely to ever form an effective voting bloc or have their needs and desires reflected in mainstream politics like the average Australian might. Also, the statistics for quality of life are extremely poor when compared to the average Australian, in terms of social and financial mobility, education, health, prison incarceration rates, birth complication rates etc. The average life expectancy of an indigenous Australian is at least 8 years lower than the average Australian. These have been persistent gaps in societal outcomes that haven't closed despite decades of government focus and money, hence trying something new, like the Voice.

"It won't do anything, so there's no point creating it" The argument was that this body has no executive powers, and can only talk 'at' the government, and there's no obligation in the current wording in the referendum, that the government even needs to listen. So it won't achieve anything at all, it will be useless and ineffective.

"It does too much" The argument was that it was too powerful, and would put too much unequal power in the hands of indigenous Australians, and that it would therefore be unfair and unequal. That it would allow indigenous Australians to create laws, change them, create treaties between them and Australia, recognise indigenous land rights etc.

Lots more out there, but that's it for now from me