A recurring theme with hard brexiteers was that making “short term” sacrifices was worth it for “reclaiming sovereignty”, which would magically lead to more prosperity in the “long term”. To some, (others) being worse off than before, is a price they’d gladly (let others) pay if it would allow “their team” to score a victory.
In the Usa there’s people cheering for Russia, for the downfall of USA democracy and for Trump to be king. These are such extreme standpoints that it’s hard to believe that they would be serious, but when you see them on camera, then it’s obvious that they are true believers and that they’re not being sarcastic. If those people are real, then I can easily imagine some spiteful british person saying unironically that being worse off now, is a sacrifice that they’re willing to make for “reclaiming sovereignty”. Especially if it’s online and they actually live and work in Sint-Petersburg.
In a world where The Onion cannot make up news that is crazier than the actual news, irony is always going to have hard time.