Its confirmation bias, they filter out all the information they don't want to see, whilst trusting everything that confirms what they already think they know.
I mean calling a campaign run by people who went to public schools and Oxford, paid for by millionaires, and backed by a newspapers owned by a non-dom hereditary peer, non dom knights of the realm and Rupert Murdoch anti- lite is ridiculous.
Not questioning why these people wanted this, what their vested interest was, is further example.
Repeatedly attacking any organisation or person who presented opposing views as having vested interests in the EU because the EU was paying them was another thing.