“Proper Brexit doesn't have any specific form because it's never been done before.”
Proper Brexit involves leaving the EU, plain and simple. All the rest – the deals, the negotiations, the terms – answers to all the questions you ask, must not be allowed to jeopardise our complete and utter disassociation from the Union. Because it has not been done before does not mean we should not know how to do it.
“I can see that the EU may start offering rights and EU citizenship to Britons after Brexit”
Rights, maybe. Citizenship, no, because there is no such thing as EU citizenship. All the 500m citizens are citizens of the member states, not of the EU. Euromaniacs like people to think they are "EU citizens". It gives them a feeling of importance. Unfortunately many people believe this contention to be true.
"it just pains me that you have inflicted this mess on the country with such strange right wing nationalistic ideals belonging more in a 1970's sitcom"
The ideals may seem strange to you but I would dispute that they are "right wing" or "nationalistic". Far more countries exist outside blocs such as the EU than exist within one. In fact, I do not know of any amalgamations of nations that are anything like the EU. I cannot imagine any normal nation agreeing to see vast sums of its taxpayers’ money being transferred to an unelected group of mainly foreign politicians over whom they have no control. Nor can I imagine any normal nation allowing legislation to be promoted by a similar group, especially when that legislation trumps domestic law.
You mention how young people may view “Brexit” in the future. Only time will tell. But I believe the scenario you describe is unlikely (especially following the inevitable break up of the EU in its current form). Instead I believe that not only will they be grateful for the majority of those who voted voting to leave but they will ask themselves how on earth the UK allowed its politicians to sign away democratic control which should be in their hands to a bunch of unelected foreign bureaucrats.