Therein lies the problem, "Remainers" have not accepted that we have left, then proceed to insult Brexiters, many posts have been deleted on that basis, also use every opportunity to deride the process or any possible deal itself, they haven't moved beyond 2016 and is still living in a time warp, the whole thing has moved on since, we have also left the EU entirely so rejoin would be as a totally new applicant, a clear non starter.
The Red Wall voters deal with their own reality not Remainer's fantasy, they haven't forgotten how they were insulted and derided by Momentum activists and extreme Remainers, Labour was warned about their behavior toward their core voters, it was ignored, when they lost, instead of examining why they lost they wrapped themselves in martyrs cloth and spoke of traitors leaving the "cause", such delusions will only condemn Labour to lose again and again.
I have voted Labour in the past but I couldn't bring myself to vote for a Communist party that does fake virtue signalling and gesture politics spin, Clement Atlee would spinning in his grave if he had known how Labour had turned out today.