Micro-aggression

It may be important to first note that Collegium defines the collection of letters ‘micro-aggression’ differently than the coiners of the concepts. Simply, because we think that defining ‘micro-aggression’ as ‘small aggressions’ is more parsimonious or precise than as ‘casual degradations’, which are in themselves types of microaggression. 
Microaggression is sometimes noted to be a subtle form of aggression, or a covert one. 
* See more particularly: Casual degradation
* See more generally: Hostility