I'm like you, IntuitiveMind. That kind of thing bugs me. But other people just do not think the way you and I do. What seems obvious to you (and maybe me as well) is just so far away for other people and vice versa.
Since the matter has bothered you enough to ask the question over the Internet, here on HubPages you have to address it, because there's probably something deeper going than what you're saying. But that I cannot know.
Just say to your husband something like this: "Ralph, I love and appreciate you. You're a wondeful man, husband, and (father?). You know, Ralph, when you and I are sitting in the living room watching t.v., and you go into the kitchen to grab a snack for yourself without asking me if I want something, I feel a little left out. I feel slightly neglected when you do this."
Say to him: "You and I are life partners, Ralph. We're in this together. I know this request may not be logical but its important to me. When you go into the kitchen for a snack, would you please check with me?"
If something like that works, great! If not, you have to decide if you can live with his habit.