In case anybody else missed whatever fight they are talking about in this: Ben White and Zinchenko had a heated exchange after the whistle at Forest, which Arteta came and intervened in before they went to the dressing room.
Ian Wright commented that he assumed it was Ben telling Zinchenko they should've done better to keep a clean sheet. He also said he would have preferred if Arteta let them have it out until they got into the change rooms. I guess without knowing what was said though, you can't know if what he did was right. For all we know, Arteta was telling them to go have it out in the change rooms which I'd say is the right thing to do.