SPOILER ALERT:   This post contains spoilers from Episode 3 of “ Half Man ,” now streaming on  HBO Max . “Half Man,” the new drama from “Baby Reindeer” creator Richard Gadd , has split viewers and critics alike thanks to its brutal depiction of misogyny, violence and toxic masculinity. Following the story of two teenage boys — Niall and Ruben — whose mothers are in a romantic relationship, it is told primarily through their eyes , with Mitchell Robertson, and later Jamie Bell , playing younger and older Niall and Stuart Campbell, then Gadd, playing Ruben. Popular on Variety In the second episode, Niall meets Joanna, one of his freshman flatmates at university, who, like almost everyone else in Ruben’s orbit, is subjected to his extreme behavior. Played by newcomer Julie Cullen, Joanna’s bubbly blonde naivete belies hidden depths, and she quickly proves herself to be a crucial voice in Niall’s trajectory.…