> I don't mean to be curt
I'll repay the same courtesy: Your argument is predicted and refuted by your sibling thread of twenty minutes ago. https://news.ycombinator.com/item?id=9501084
Microaggression is a term of jargon, as Google would have happily informed you. Its root word, not its synonym, is "aggression". Microaggressions are by definition not intended to hurt, or they would be, you know, aggressions.
That's an important concept, because it augments your theory of mind with this fact: There are things that you do, from time to time, that hurt other people in ways too small for them to complain about. For the most part, these things are random and not worth the effort to try to predict and avoid. And no one would ever call out one of these things as offensive, because taken individually, they aren't.
But certain individuals, and certain groups of people, are "randomly" subject to that sort of thing far more often than others. Your barely-hurtful word is a barely-wet raindrop in the ocean of hurt that defines their world. And certainly you can't do anything about their ocean, but maybe, sometimes, it could be worth your effort to not participate.
Basically, I'm not trying to give you rules to follow. I'm trying to suggest that the world does have patterns, and the way to relate to patterns is with rules. So please, make your own rules, but don't reject the whole idea-- or else live in a world you understand and fit in to a little bit less.