someone who claimed over half the population of the UK voted for Brexit. I pointed out that if he thought that 17 million was half of 66 million then he should go back to school.
They are IMO either not very intelligent and incapable of critical thinking.
Literally speaking, his words are not correct; however, it's splitting hairs to pull him up on this as the spirit of what he's saying IS correct.
Every adult (with a very few exceptions) had the vote. Those who chose not to use their vote, for whatever reason - and who had every right to make this decision - were voluntarily excluding themselves from the electorate on this occasion and neutralising the potential of the vote that they would have been eligible to have.
They were communicating that they didn't know and/or care one way or the other and thus were delegating the choice to those who DID want to have a say; meaning that the effective electorate was significantly reduced to the number who DID decide to use their votes.
A small majority of the effective electorate (i.e. those from the eligible pool who self-selected and chose to participate and state an opinion) DID vote to leave.
Therefore, he was technically wrong to claim that half of the population voted to leave, but it would not be wrong to say that the majority electorate decision was to leave.
Don't forget that those who decided not to vote, and therefore didn't vote for Brexit, also didn't vote to remain.
Also, bearing in mind the nasty, arrogant sweeping ageist proclamations that have been widely made - i.e. that all of the elderly voted to leave because they're supposedly selfish, stupid, ill-informed, racist, bigoted, whatever; the elderly are statistically far more likely to be in the group of those who might have wanted to vote but were unable to do so owing to disability or infirmity preventing them from getting to the poll booth - and are less likely to be online to have easily and confidently explored alternative voting options.
Also, it's ignored or brushed aside as of no consequence, but let's not forget the fact that only people aged over 60 have adult experience of both being IN and OUT of the EU/EEC/Common Market/proposed USE.