I can't agree on the "**** the experts etc" and I still don't think you've presented anything that changes that viewpoint for me. You mention putting the polished positions the spokespeople put forward. However you have to ask yourself why they campaigned on that reasoning. I think they were simply latching onto something that had been sat there dormant for a very long time. We have never sat happily inside the EU as a government, a people, from the day we entered. It has always had a large element of people who don't think we belong in it. I assumed that we all knew that all along. I probably thought they were not in a majority, it turns out I was wrong.
I can only comment on the people I've spoken to, and generally they dispel the myth that they were influenced by campaign promises, that they are racist or xenophobic, that leave voters are a bit thick and don't know what they voted for. Its these very lazy assertions which I have a problem with. I think it is far easier to listen to what people say. Granted out of the 17m odd who voted to leave, I can't speak to every single one of them. I couldn't say how many leave supporters I've spoken to about Brexit over the last 3 years, but I have to say those that I have, very few have uttered the phrases or anything like them you mention as a reason. They may say it in combination with their reasoning, because politicians and their elitism are rightly castigated by just about all. Generally what I find is the people who make that comment in isolation, just don't vote and didn't vote in the EU decision. Why? They are so turned off by politics and politicians, they hold the view that their vote doesn't matter so why bother.