The New York Post gets the skinny on the wild animal argument between Francisco Lindor and Jeff McNeill in April. It was actually about McNeill failing to shift properly:

The shortstop Lindor, frustrated by the second baseman’s latest positioning gaffe and their ensuing argument, according to a club source, grabbed McNeil by the throat and pinned him against a wall in the tunnel. Before the situation could escalate, Mets players hearing the commotion arrived to break it up.

NYPost.com

The Mets also fired their interim GM. It seems that new ownership failed to change the culture that is the Mets