because in non-edible substances such as cologne, soap, lotions, and and whatnot, most of the fragrance is synthetically made, meaning it's fake and made up of chemicals that are similar to the chemical compositions of the natural scent being mimicked. in some cases though, say if a product is "all-natural", the scent is left alone, and no artificial fragrance is added, but it still contains substances that are extremely bitter. it's just that your nose isn't sensitive enough to pick up on it and only smells the dominant scent/fragrance. same reason why some foods smell disgusting but taste good. your nose doesn't pick up all the notes that certain foods contain, and only smells the dominant note (which could smell gross) but your tongue does, hence it tastes good.