Brexit isn't going to "destroy the UK".
I hope not, but even a Brexiter cheerleader like Peter North thinks that the impact of a Hard Brexit will be profound: "In the first year or so we are going to lose a lot of manufacturing. Virtually all JIT export manufacturing will fold inside a year."
The World Bank has put numbers on this and the analysis suggests that the UK will suffer a loss of trade with the EU of 62% of services and 50% of goods. So just think through the implications of this: if you work for a business that deals with the EU, will you employer be able to continue to trade if the business loses 50% of customers? Will you still have a job? If you do have a job, will your employer be able or willing to pay you the same wage as now? Or will Raab and Johnson succeed in removing the minimum wage and working time laws, so that you might still have a job, but you'll be paid far less than now. If 50% of the people in your community lost their jobs, what would the impact be - on shops, on tax receipts, on social services? If you, or your partner, or son or daughter lost their jobs (and in some communities you might all lose your jobs) what would the impact be?
If food, medicine and fuel has to be rationed, how will this impact on you? Will someone in your family need to give up their job in order to spend hours queuing for just the basics?
The UK survived the Thatcher era by managing to attract foreign investment - e.g. Nissan, Honda, Hitachi - to replace the British businesses that had gone to the wall. In addition, there was North Sea revenue to act as a cushion for a few years, and the UK was still the key international financial centre. Post-Brexit, manufacturing will move out and the finance industry will be locked out of the EU and world markets, so there might be nothing left on which to build the recovery.
It's ironic that we're discussing degrees of hardship/problems/'shit' when JRM, Davis and Johnson keep insisting that Brexit represents the gateway to golden opportunities - without ever explaining how this magical thinking is going to materialise.