Come on man. By that standard, the average 50-millionaire isn't Rich, because billionaires exist. What is relatively or comparatively affordable for people who are already in a pretty rarefied wealth class isn't really relevant to the topic.
What is relevant is how normal people in the general public perceive this stuff. And by that standard, something like an Emira is absolutely an exceptional and unusual performance vehicle that would easily go on a poster on a kid's wall. That, for me, is the difference between a regular car and a supercar.
"Sports car" vs "supercar" vs "hypercar" is all pretty irrelevant. Those are all terms that were made up in the last 10 years or 15 years or so to justify stratification among products in an ultra elite class of ultra expensive, insanely engineered luxury products.
To the average person, there's simply no meaningful difference between a Lamborghini and a Koenigsegg. They are both absurd, extravagant, desirable, and financially unattainable.
The Emira is far less expensive than either of those, but $100K is still an absolutely incredible amount of money for the average person in the United States. Definitely not within the realm of reasonable or rational cost when you're talking about something that only has utility as transportation for two adults.
So is it a supercar? It's in the eye of the beholder. But I think to the average person, it qualifies.