To be fair (a) I don't think he was trying to do that, and (b) I'm struggling to think of an argument that would shine good light on brexit voters ?

Perhaps that they're wonderfully trusting people who believe whatever politicians that Gary down the pub thinks are the best ?

It’s not supposed to. There is no light that can present anybody who voted for Brexit as anything other than a fuckwit.

Brexit voters were plain gullible.