Parents can love more than one child, and Max went from having three children and three grandchildren (most descended from his beloved wife), to one child born from an affair he only admitted to after Lorna forced his hand and even now admits he knows nothing about. Max has always wanted the twins at his side since the brotherhood days before they knew they were related, and that desire has clearly never gone away.
I would say his aggression was less about hating Wanda, and more to do with his inability to answer how he would want. He loves her, but he can’t take an official stance in defense of her without drawing heat from the QC. I’m looking forward to how Ewing handles this, as he seems to have a soft spot for the Maximoff and Minimoff twins (Avengers No Surrender, and now Empyre).