The sarcastic tone is likely because of the price. There is something jarring about such a simple product, even if it was made by an artist with a good eye for color, being behind such a large paywall. Most people find this app, even forgetting "Orange," to be overpriced, myself included. It should be expected for people to use the most extreme examples to point out the absurdity and to laugh at it, especially when it's being marketed to the public.
Had this been an app you buy for $10 once, still there would be people like this, but much less. And if it were free, for example, nobody would bat an eye. The outrage is caused by price.
I'm not invested in this debacle at all, really. I just found your lack of understanding interesting. Not trying to offend you by that.
It depends how much sugar. I have type 1, and if I had 20 grams on accident, it could ruin my levels for half a day but not the end of the world. If I had 45 grams (a can of soda) or more on accident I'd probably just go to the hospital at that point. Or at least I'd be scared. Once blood sugar levels get too high it's rough to control and you're in a somewhat fragile state. And also you start to feel like shit the longer it goes on (dka.)
I guess I'm saying is usually no it won't kill you but especially for type 1 people it'd probably make for a somewhat traumatic experience.