1. In some cases, but perceived screen size is relative to your distance from it. A medium-sized TV can sufficiently fill my visual field as long as I'm not sitting clear across the room from it. Maybe not quite the same, but close enough for me. Bonus: My sofa's comfier than most theater chairs - and less sticky - and no tall people ever sit in front of me at home and block a corner of the screen (except the cat sometimes).
2. I don't need a group of people telling me when to laugh, thank you very much. My own emotional acuity is perfectly adequate for my enjoyment. When I do want company for a movie, friends and family make for a much more enjoyable shared experience than the random crowds of strangers at the theater.
3. I honestly can't relate to this issue. If you can't ignore your electronics long enough to watch a two or three hour movie, you may need to disconnect for a while.
4. Also can't relate, although I know there are many people like that. But even in the theater you can close your eyes and plug your ears to avoid the scary (my wife does this). Bonus: Watching at home is less relentless in bad ways; in a theater you can't pause to use the restroom or rewind to catch important missed dialog.
5. Theather-quality home speaker systems can be prohibitively expensive, but you can still get good quality for the price even on a budget. I'm not much of an audiophile, though, and am reasonably content with a $100 2.1 sound bar. YMMV.
6. Previews? Ick. I deliberately arrive a couple minutes late to avoid previews. If you like them so much, watch the ones you want on YouTube, not the limited selection they offer before your movie. I don't like paying to be advertised to.
7. Again, can't really relate. I can see how that would affect some people, but I don't watch a lot on the TV so sitting down to a movie really does feel like a time that's set apart. YMMV.
8. TRUE alone time at home, with your significant other, is also a cherished pastime and WITHOUT all those annoying "other people." Not everyone likes crowds - in fact, some of us *hate* them and go out of our way to avoid them.
9. Why not 32 ounces of diabet... er... cola in the dark that I don't have to pay $10 for? At home I can have full access to all my favorite snacks, on the cheap, no smuggling required.
10. Huh? Do you also brag that you wandered Walmart for 30 minutes trying to decide on a nice pillow to buy, instead of just getting one on Amazon in 5 minutes? Unless it's a premier showing of Star Wars, Star Trek, or some other suitably awesome movie, there are no bragging rights attached to watching a movie in the theater. And even then it's negligible.