I think the problem is that if you are watching a film together, even if one person hates it, there can be the illusion that it is a shared activity, it is companionable, you can refer to it afterwards and comment on something in it and the other person will agree/disagree whatever. This still works if you knit or sew, but if one person is reading a book or using a device, you can no longer hold on to that feeling
What does DH do if you watch a chick flick? Even if you don’t like them, try insisting on alternate choices and make sure you sometimes choose something he hates. Does he read a book, leave the room or fall asleep? You could offer him you phone to play with! Once you’ve made the point you can stop watching the rubbish and have a serious conversation about the situation.
I must admit that when I visit/am visited by family, I do not feel any companionship with them if they are on a device whereas if I watch tv it feels one step closer to being with them.