Is this more of the "the EU will be massive dicks to us as a warning to others, rather than act in their own self-interest" that I've been hearing lately?
Being dicks to UK is in the own interest of a lot of leaders in EU who have to face internally the push from extreme right and face them as competitors in elections.
Also, the blaming game can work wonders the other way around too. Anything slightly bad happening with EU's economy in the next years will be because of the evil Britons.