When Brexit won the 2016 referendum, the flopsie remoaners complained that it was only because of lies. In particular, they focused on the Brexit campaign bus which gave the gross UK weekly contribution, when they thought it should have been the net figure, after deduction of what the EU spends in the UK.
Boris Johnson has just won a considerable majority in the general election. The flopsies will not like that at all. They will want to say the election was stolen by lies.
But this time, there is no very obvious bus.
My guess is that they will keep looking. They will be quite unable to accept that the electorate does not buy their brand of champagne socialism.