It is delicious with butter at home. While movie theater popcorn has an addictive flavor, there is no butter in it at all. They dust the popcorn with Flavacol when it pops to make it look buttery and the liquid "butter" is partially hydrogenated soybean oil (a.k.a. trans fats), beta carotene (a coloring, makes carrots orange), tertiary Butylhydroquinone or TBHQ (synthetic preservative that keeps the color and texture from changing as the product sits), polydimethylsiloxane (silicone based chemical that prevents foaming), and buttery flavoring.
Don't get me wrong, it tastes good, but I know it hurts my stomach, too. The stuff at home when real butter is added is great! It would just be tricky getting it to the theater.
I want to see Frozen II to make sure it is okay for my oldest to see. Not sure if I will get the chance. Movie theaters are a rarity these days. (I did get out to see Maleficent 2, though. First movie theater movie in 3 years). She loves Elsa. I hope there is no super questionable content in it.