This trope, coined ‘fridging’, was ironically borne out of an issue of a Green Lantern comic, where Lantern Kyle Rayner comes home to find his girlfriend brutally killed and stuffed in the refrigerator.
So I can see why some people would take issue with Deadpool 2 using such a common trope.
As David Leitch notes to Comicbook.com, he isn’t someone who has a problem with strong women in his movies, as the scene-stealing Domino attests to.
I imagine many people who took issue with this decision because it is such an overused device in stories.