The words we use signal to others how much we know, care, or care to know.
Language is a powerful tool; it shapes our realities. Language is used to present and perpetuate particular views of society and
of ‘others’. Language can consciously or unconsciously offend, intimidate, reinforce harmful stereotypes and contribute to the unequal status of individuals.
Language can be aggressive even if we don't intend it to be
A micro-aggression is a subtle, often automatic, stereotypical, and insensitive behavior or comment or assumption about a person’s identity, background, ethnicity, or disability. Micro-aggressions may be intentional or non-intentional.
Micro-invalidation, degrading a person’s wholeness through making false assumptions about the other’s ability, causing a sense of invalidation.
Generally, descriptors that refer to personal attributes such as race, gender, sexual orientation, disability or age, for example, tend to over-emphasize and draw undue attention to the distinguishing attribute.
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http://hrcouncil.ca/hr-toolkit/diversity-language-guidelines.cfm