That man, the notoriously awful Ukranian pseudo-red-carpet-reporter Vitalii Sediuk, is known for assaulting celebrities like America Ferrara, Bradley Cooper, Leonardo DiCaprio, and Adele.
"I was at the end of the line signing autographs, when out the corner of my eye I saw someone stage-diving over the barrier at me. I took a step back; this guy had latched onto my lapels. I looked down and the nutter was trying to bury his face in my crotch, so I cracked him twice in the back of the head – not too hard – but enough to get his attention, because he did let go. I think he was then just grabbing for a hand hold because the guys were on him, and he reached up and caught my glasses."
Badass Pitt also warns that if Sediuk tries his assault-and-battery schtick again, "he's going to get stomped."