He’s traumatized and very angry over Alannah’s passing. I don’t think anyone is denying that. However, Debbie was also a victim of Omni-Man and barely holding together with her own trauma from him (learning about his murdering of the guardians, being dehumanized with the pet line, watching as he not only killed thousands in his skirmish with Mark but also seeing him beat her son nearly to death). The fact he told her “it won’t be a safe space for you” just hurt like a truck…

He’s looking for someone to direct his anger towards and I get it (and I doubt a lot of people would have empathy for the wife of a mass killer if someone they knew/loved were victims of said killer), but yeah, he’s totally a Dick for saying that shit right after she poured her heart out with how much Nolan’s actions have tortured her mentally…