Ah yes, there's the conceit.
Those who voted yes did so out of emotion and ignorance. None of them did so because they thought the likely (or even just the possible) consequences would be good.
Those are not mutually exclusive. Lots of people voted 'leave' because they believed that the likely (or even just the possible) consequences would be good. And they believed that because they were ignorant, and/or because they allowed their emotions to overrule their reason, or their inquisitiveness. They believed it because they either didn't think; or because they started thinking from a position of ignorance, and based their reasoning on falsehoods; or because they consider their emotions to be more important than their long term self-interest.
Lots of 'leave' voters STILL want so badly for Brexit to be the best thing since the heyday of the British Empire that they can't see that the harm MASSIVELY outweighs the good.
They are mostly fuckwitted racist morons, with no idea about the actual facts of the situation, much less the ability to predict the consequences of those facts in the event of a 'leave' vote. None of that means that they don't honestly and sincerely believe that the likely (or even just the possible) consequences would be good.
So you can take your glib accusations of conceit, and shove them. Brexit is an observably and objectively bad thing for the UK, for Europe, and (to a lesser degree) for the rest of the world. It's not even close. The ONLY benefits I have heard any Brexiter claim for leaving are either untrue "We will save millions and spend them on the NHS"; or purely emotional "We will make Britain Great again".
If you can come up with a fact based reason why Brexit was good for the UK, I would love to hear it.