That list of cognitive disorders at the end is sobering. I think I fall prey to 9 of the 12. *sigh*[DOUBLEPOST=1439392347,1439392087][/DOUBLEPOST]My interpretation of a micro-aggression doesn't include things like American History X, either. It's supposed to be more the things someone might do that are/can be offensive, because he doesn't know any better. People who grew up in 95% white towns can sometimes be unaware that certain ways of speaking or words can be seen as discriminatory or offensive, not because of ill will but due to lack of experience.
Without the internet, how many of us might call someone with, say, Down syndrome "mongoloid"? It's a derogatory term, but if you don't come into contact with someone who tells you, you might think it's a perfectly acceptable term. Ditto for, say, "dwarf", and so on.