Can you help me explain that to my Brasilian brother-in-law, who holds an Italian passport, or the anarchist mate I'd always previously assumed was second-generation Italian, or my partner's Portuguese NHS colleagues, or my relatives who live along the northern side of the Irish border, or the old school friend who explained how his recent redundancy was specifically due to Brexit? All of them see this as an unmitigated disaster, even if they appreciate the contradictions with the EU.
Simply dismissing their fears, never mind all the others who voted remain out of concern for people like them, as no different from uncritical supporters of the EU shows a basic lack of solidarity. That doesn't mean there isn't a political case for Lexit, but how this will come about is far from clear, leaving plenty of room for legitimate concerns about what happens next. After all, you don't need to be nostalgic about Keynesianism to see that neoliberalism was a disaster for most people. Given the current balance of power, it's hard to see events not following a similar trajectory, only worse.