Actually the poster never said the word "during" in the post. But anyways, it's new, so it will take a few days to adjust but it'll become natural for most people.Please read more carefully. They didn't say 3D Touch "to reorder contacts" - they said "during" reordering their contacts the natural touch pressure you use to move contacts up or down the list, ends up "misfiring" the force touch mechanism which brings up a window where FaceTimimg people is a choice.
Or adjust the sensitivity or turn it off. Simple enough.