Boris went boldly with courage deep into the heart of enemy territory and returned unscathed. Can you imagine the reception if Juncker dared to address a Brexit party conference? It's the same but reverse scenario, the difference is the EU chicken Juncker wouldn't dare turn up even after the usual swift cognac or ten.
The uncivil rudeness in the way the UK PM was treated is very welcome by brexiteers, in 5 minutes hundreds more UK voters convert to the clean, no deal Brexit cause washing their hands of the EU. Thank you Luxembourg!