I know we are used to people online having the wildest disagreement because of contrarianism or something, but in this case, there is a perfectly reasonable explanation:

You know we have three different types (sometimes four) of color sensors in our eyes? And that people who miss one or several of them are "colorblind" and fail tests like the Ishihara Test?

Well, human noses have hundreds of possible olfactory receptors, and everyone of us only has a subset of these, which means we are all "smellblind" one way or another.

https://www.ncbi.nlm.nih.gov/books/NBK10824/

Each one of us smells perfumes differently. The only think that we can agree on is a shared association or experience like the smell of a standard object (e.g. a road, asphalt) or of a common plant (flower or food).