I find the whole trade argument particularly baffling, it's like Brexiteers seem to think we have warehouses full of goods that we can't shift because of the evil EU intentionally screwing us over in trade deals and once we leave we will suddenly begin selling the lot. To sell more you have to both have someone who wants to buy more and then the capacity to produce it, neither are true with Brexit. It also ignores how much of our trade we got largely because we were in the EU, apparently the think we would keep all that.
It's just an insane exercise in fiction. It's like when we whinge about being stuck to the European convention of human rights imposed on us by the EU when actually we practically wrote the damn thing and imposed it on Europe! It was the other bloody way round!
I think that article hit the nail on the head, a lot of Brits hark back to the days of the empire and, when you listen to how they talk about the Commonwealth, it seems some still aren't aware it's gone. People talk about the Commonwealth like it's the empire, that we just go to them demanding more trade to enrich ourselves and they will bow down to our demands like the good little servile colonies they are. It highlights the attitude of complete disregard for the opinions of other countries when you listen to Brexiters talking about how we are going to position ourselves on the world stage.