in a sense, all descriptors are categories. Broad, common terms are helpful when group members with similar interests work cooperatively in organizations categorized as, for example, academic, athletic, scientific, musical, and health.
Categories are convenient in taxonomic classification of all phenomena. But precise boundaries of categories can only be theoretical or arbitrary, because finite, exact boundaries can only be surmised. Categorizing phenomena is useful but imprecise, because gray areas, variable qualities, anomalies, and larger truths overlap with other categories. And an unwanted simplistic dualism arises when using, for example, the terms black/white, right/wrong, yin/yang, good/bad.
As unique individuals, we prefer not to be categorized, grouped, labelled, defined, or classified. If you are unfairly labelled or incorrectly categorized by others, assert your uniqueness and autonomy: correct their misperception.