I haven't resorted to characterising Brexiteers as thickos, although others certainly have. It wasn't really up to me to explain the case for Remain, but it was for:
-- the Remain camp -- who just went down the 'Project Fear' route, that was well exposed by the Leave camp; whereas they should...
As against both Iraq and Brexit as I was, I wouldn't necessarily characterise either as deploying lies, precisely because facts pertain to the past, whereas what most of these were dealing with was what might happen in the future.
The big difference is that:
-- over the invasion of Iraq, it was the MPs that had been subjected to, and believed, the (non-sexed down) information, whereas about half the public (see opinion polls at the time) thought it was all a load of tosh -- on this, from the little I've gleaned from...