I dunno, I'm still not convinced it was intentional. He's an awkward dude, and was awkward multiple times that day. The simpler explanation that he was overstimulated and flailing about seems more likely to me.

Assuming it was intentional, what does he gain from it? If its to signal to right, why do this now rather than something more subtle? If its to shock and make headlines, why not show up dressed as Goebbels?