They are both stupid, but in a good way

I think that is still enjoying coffee in your own way. I don't think you need to drink straight black coffee or espresso to be able to enjoy coffee. I say this as a person who has worked in coffee extensively. From being a barista, to a bartender, to working in a roastery, to working as an espresso machine technician, to a trainer. And coffee in itself is an acquired taste and most people forget that bc it's so normal in today's society. If the only way for you to enjoy is with ice cream or as a frappuccino then by all means, don't let anyone make you not enjoy your treat.

Thank you, you are very sweet... But I do not drink coffee, if I can avoid it. We have a "Make a mistake, eat the mistake" rule (which is okay, most of the time we share, or take it home). So if I get a coffee order wrong, I add everything so I can drink it. I prefer tea and cocoa

Same, but I'm even worse when it comes to coffee. Even with a bunch of sweeteners, just the hint of coffee makes me dislike the drink.

I also absolutely hate the smell of coffee. Coffee almost smells like burning garbage to me, and gives me a headache if I'm around the smell for too long.

I keep wondering if MC will meet her final boss, which is somebody like me, who just can't like coffee no matter what MC does and is even turned off by the smell of it.

While I love the smell and can't agree with you there... Fair. Taste and scent are very subjective.

If there will be an endboss (I do guess it will be the ones she has "insulted" until now like her family and the advisor), I do hope they are called Muffin Queen, because it kinda fits the theme (=・ω・=)