It's been said many times, but every single right wing despot in Europe was cock-a-hoop about Brexit as it supported their world view that foreigners are bad and borders need to be fortified. That's not really up for debate imo. The far left also have history in opposing migration because they believe it undercuts domestic wages, or as the RMT delightfully call it 'social dumping'.
As for Labour voters, y'know, it's quite possible for people to have
left leaning economic views and yet be very socially conservative. Indeed, I'd argue on the basis of their posts on here that people like
@Joey66 fits into that box.
As you say though, it's 'not your fight' any more, so I trust you won't be using the mess left behind to say how dreadful the EU is.