Joe Biden Oddly Mocks a Reporter: “Why, why, why ... You get nervous, man! Calm down."

Joe Biden accuses CBS reporter of getting nervous and tells him to calm down after he repeatedly says "why" to the reporter. How strange is Joe going to get?

"After the appearance, CBS News' Ed O'Keefe asked Biden why he said he had accepted Sanders' apology but continued to attack him. Biden turned around and mocked the question, "Why why why why why," he asked, tapping O'Keefe on the lapels, then smoothing them, he told O'Keefe, "You're getting nervous, man! Calm down! It's ok."
https://www.cbsnews.com/news/bernie-sanders-and-joe-biden-continue-to-trade-fire-over-social-security/?ftag=CNM-00-10aab7e&linkId=81066806

“Biden then gave the reporter a gentle left-hand fist bump before turning and continuing on his way.” - "Joe Biden loses cool after reporter grills him about feud with Bernie Sanders https://nypost.com/2020/01/22/joe-biden-loses-cool-after-reporter-grills-him-about-feud-with-bernie-sanders/