I looked it up and youre definition is right, my bad.

It just sounds off to me to name something unintentionaly with the word aggression as the definition of aggression contains an intent to cause harm.

Not shure, would say microaggressions are something intentional or at least come from dislikeing the other person. This examples are rude and hurtful but I dont think that they are intentionall and come more from prejudice and bias that people picked up over they life and most people probably doesn’t even recognize when doing so.