I think he's referring to Leave's argument that the EU was not in fact acting in the best interests of the people. This is because it is "undemocratic" - undeni

I think he's referring to Leave's argument that the EU was not in fact acting in the best interests of the people. This is because it is "undemocratic" - undeniable facts such as you can't buy straight bananas, re-cycle a teabag or have the freedom to trawl all the fish you want from British waters were, for example, put forward as proofs.