A serving is often treated as singular a unit in English. Popcorn, rice, candy, etc. "I ate all of it," not "I ate all of them." Only when referring to pieces of popcorn does it become them.
You really need to experience homemade kettle corn. It's a bit of a process, and way more work than just popping a bag in the microwave, but it's absolutely delicious.
Man, I don't know how but somehow the box of microwave popcorn I bought recently is defective. I put it in for double the time it says to and it still doesn't pop most of the kernels and the popcorn it does manage to pop is like... Stale? I don't even know how to describe it. It's cruncier and firmer than it should be and is almost totally lacking in butter flavor despite being the "extra theatre butter" style.
How the fuck does popcorn go bad before it's ever even been popped? 🤨 Anyway, what I have is definitely "ugly popcorn."
It went bad because it somehow dried out (maybe the seal was defective). Popcorn pops by heating the water inside the kernel to the point it bursts open. If you have old popcorn, you can soak the kernels for 10 to 60 min, pat dry, and then heat.
I hope your future popcorn is prettier. Or that you enjoy pity popcorn.