"I think he was getting involved in the match for a long time, though. I don’t mind it, I love when fans are loud, I love when fans are emotional"
sounds like the guy had been cheering loudly in support of Zverev the whole match, and this was after a couple of hours and the guy legitimately just got really carried away shouting some stupid shit.. doesn't sound like the fan was seriously supporting Hitler or anything.. apparently just a loud moron who needed some attention..