On a near-noise level, virtually all conversation or interaction can and mostly does contain shades of meaning expressing things that when verbalized explicitly would be considered rude or inappropriate. From that POV, the term appears meaningless or redundant. Otherwise we'd communicate like Vulcans.
EDIT: I find it also peculiar that the explanation you've cited only mentions "racial slights", despite neither "micro-" nor "-aggression" containing this meaning. But it's comforting to know that one is at least safe from committing such things across all the other social boundaries! /s
> Like when they say white male. Oh, nevermind that does not qualify because it is against whites and males, so it is ok.
The kindest way to interpret this is that it is your opinion, and if it is, it is wrong. It is not ok to harass white males for being white males. A more likely way to interpret it is that you're putting words into other people's mouths, then sneering at those words.
I feel like this is obvious enough that it's not worth commenting about. Do these wasted words qualify me to downvote you?
EDIT: I find it also peculiar that the explanation you've cited only mentions "racial slights", despite neither "micro-" nor "-aggression" containing this meaning. But it's comforting to know that one is at least safe from committing such things across all the other social boundaries! /s