That's the biggest problem with the show, much as it has many problems. The handmaids' isolation of Ofmatthew needed to be incredibly subtle. Them deciding she was an outcast and removing from her any small acts of solidarity they may previously have shown her would be believable. Her slowly crumbling under the loss of a connection that she didn't think she'd miss until it was gone as she struggles to deal with her 4th pregnancy and her fears the baby would be a girl, and possibly her gnawing guilt that the Martha died, would be believable. June and her red dress gang visibly bullying her in front of Aunt Lydia was ridiculous on every level. Aunt Lydia taking June's accusation against Ofmatthew at face value and forcing her to be berated by all the women she knew were bullying her just after she had already told June to stop them from bullying her, was ridiculous. Lydia may have taken the accusation seriously and dealt with Ofmatthew's feeling privately, but she wouldn't have played right into June's hands like such an utter ridiculous dupe.
Then even more ridiculous, in the supermarket when June is told by Lydia that she will move her from what is a relative sanctuary with the Lawrences back into a household where she will be ritually raped again, June zones out of this important conversation so she can turn her head to the side and angle it so Ofmatthew can see her crazed smile. Somehow knowing that this will break her. She smirks her way through Janine's beating and just makes a big Skeletor smile face when a gun is pointed at her, before psychically conveying that Ofmatthew should shoot Lydia, and Ofmatthew tries to comply. WTAF was all of that supposed to be??? It broke the bounds of any form of storytelling and was just an insane sequence of events that followed no logic and for once even the cinematography was as awful as the "plot." It was just awful on every level.
As for June being someone who has finally snapped and no longer cares for anything but hurting Gilead, that would be a fine story. I'm watching the new Das Boot series and Lizzy Caplan's Carla is a character who's resistance to the Nazis and experiences under them has brought her to such a state. And by being in this state she's not a likeable character. She is doing what we understand to be a good thing in resisting Nazis but it has cost her so much in terms of her humanity and compassion and it leads to bad decision making. But she is a believable character. If this is what we are supposed to be seeing in June, we aren't. We're just seeing a pouting teenager thumbing her nose at her oppressors. She's literally right in their faces, flouting her "resistance" and openly sneering at everyone. It's ludicrous and stupid and utterly boring to watch.