You love Klopp, we get it.
Regardless of how 'calm' he seemed from his interview that segment about United was how he really felt about the game. Here are a few other quotes you conveniently left out from your clip:
'they were purely there to defend (against) us'.
'(Defending is) the easier thing to do'.
'Ever since I'm in England Man United plays against us like this'.
'There's only one team to defend, then the other team has to make the game'.
All his actions during the game suggest he's seething but he wants to put across some kind of zen front in the post-match interview. Yeah he's not mad at all, he's gracefully accepted the point in a totally calm manner whilst acknowledging how well a depleted United team did.