Seems that Yanis Varoufakis found out the differences between being in an academic debate and within the Eurogroup. To be honest and based on personal experiences with political debates on a very different level I immediately understood what he is talking about.
HL: You’ve said creditors objected to you because “I try and talk economics in the Eurogroup, which nobody does.” What happened when you did?
YV: It’s not that it didn’t go down well – it’s that there was point blank refusal to engage in economic arguments. Point blank. … You put forward an argument that you’ve really worked on – to make sure it’s logically coherent – and you’re just faced with blank stares. It is as if you haven’t spoken. What you say is independent of what they say. You might as well have sung the Swedish national anthem – you’d have got the same reply. And that’s startling, for somebody who’s used to academic debate. … The other side always engages. Well there was no engagement at all. It was not even annoyance, it was as if one had not spoken.