No one is saying that everything is shite or that you should think that everything is shite. There's increasing evidence of the difficulties some businesses are facing. Some of those businesses are run by people who supported brexit, and some are expressing regret. Your post seemed to imply that because you or people around you have not noticed any effects then that means nothing is really happening, despite evidence that things are indeed happening.Not really any different to "I think everything is sh*t so you should".
What's the difference?