I think the public actually do have some ability to distinguish what is nonsense and what is not. I think her arguments against azodicarbonamide seem quite reasonable to me and have been acted on. Her arguments on microwave ovens on the other hand appear well nuts:

'Hari has argued against the use of microwave ovens, for reasons that include the claim that they cause water molecules to form crystals that resemble crystals that have been exposed to "negative thoughts or beliefs," including the names of Hitler and Satan.' (Wikipedia)

but I don't think many people take that seriously.