Do your popcorn on the stove. There is no reason not to, as the following reasons I'm about to offer will demonstrate.
1. It tastes better. Microwave popcorn tends to have a faux butter additive (unless you're buying light microwave popcorn, in which case there is no hope for you ) which is okay if you're not adding real butter, but of course you're adding real butter, and since you're doing it on the stove anyway you'll have a hot pan primed to melt the butter in an instant. If you're so worried about calories that you weren't going to use real butter then you should've eaten carrots or fiber pills or whatever health conscious people usually sustain themselves on. Put butter on you popcorn, like a real man or woman.
2. It's probably healthier, even with the butter! I can't verify this but I haven't tried and I don't care.
3. It's easy. It takes all of one or two extra minutes to do on the stove, and you'll have one pan to wash, and I don't even have a dishwasher. There will also be no bag to throw away, which will something something carbon footprint.
4. It's much less expensive. For a couple of dollars you get a bag of kernels that will make you the equivalent of several *boxes* worth of microwave popcorn. The financial gain here is incredible, and should be enough to convince any self respecting person to make the switch even without the other compelling reasons on display here.
5. NO LEFTOVER KERNELS. The worst thing with microwave popcorn is that half of the bag is left unpopped, leaving you with the unenviable task of either throwing it away or trying to pop the rest and inadvertently burning it. This doesn't happen with stovetop popcorn. With the secret ingredients of vegetable oil and the unfailing human spirit you will make a bowl of popcorn with ZERO unpopped kernels. How is this not a revelation? Why did I have to go 28 years before discovering this?
I think I've made my case. You win, your lady friend wins, the overly subsidized corn industry probably doesn't win but who cares about them anyway? Make stovetop popcorn great again, and so on. You have no excuse.