1) Your use of the quote in this context was arrogant and condescending and needed to be called out. I assume you understand this since it was your intention to be offensive? Red herring.
2) You seem to assume that the primary goal of Brexit is economic. For many, that is not the case. It's about sovereignty. I don't see that a trade deal involves a loss of sovereignty anywhere comparable to that involved in the EU treaties - indeed it's arguable that no sovereignty is lost at all, at least not in the same way. Red herring.
3) Brexit is not about
reduced immigration (many areas and many sectors need more immigration, not less), but
controlled immigration. As it stands we have no control over who comes in from the EU. This will change. But again - red herring, the usual Remoaner bollocks to paint those in favour of Brexit as pigmy-brained bigots, when in fact the bigotry is often the other way - good old British class snobbery.
4) There are many, economic arguments in favour of Brexit, a lot of them coming from broadly similar perspectives, not that you appear to read widely enough to have come across any. (Something that itself is a bit amusing). But you could read some of this material here on the Economists for Free Trade site:
https://www.economistsforfreetrade.com/publication/
Of course you may dismiss some of these arguments on grounds that the actions outlined are not to your political taste, but that's an entirely different argument.