Not sure if theres been any theories today on what happened but this was mine, klopp was trying to make 3 subs including Salah and Gomez, did Klopp try and get the 3 subs on at a break of play at 2-1 only for salah not to be ready and then west ham go on to equalise at 2-2 in a situation that Klopp thought Gomez would have defended better than the man he was subbing in Trent? Did Klopp go up to Salah then after the delay, pissed off and say something like "are you sure you're ready now?"
Just a theory, may be completely wrong.
No need to look so deep I don’t think!
It’s assumed it’s to do with Salah being a brat when Klopp wanted to do his isual handshake/hug with the sub before they go on. that’s what the vid doing the round shows. He doesn’t want to do that, walks off, Klopp says something, he comes back and sort of fistbumps him, and walks off to the edge of the technical area again and then all the arm-flapping starts. Just very petulant, disrespectful and uncalled for from any player let alone one so experienced.