CayleyGraph [High Praise!] takes “microaggressions” to the next level:
I think the next frontier in offense will be the study of nanoaggressions: nonverbal communication that a person could use to express contempt for an oppressed group, but that are too subtle to qualify as a microaggression.
Currently Identified Nanoaggressions
1. Yawning
2. Coughing
3. Making eye contact
4. Breaking eye contact
5. Faking eye contact
6. Slaking eye contact
7. Exhaling
There have also been exciting breakthroughs in the realm of femtoaggressions: Quantum uncertainty comes into play at that scale, so it is impossible to simultaneously know the race and sexuality of a femtoaggression.
The idea of an attoaggression is, of course, just an offensive attempt by bigots to trivialize the concept of prefixaggressions with satire. I dare say even mentioning it counts as a milliaggression.

The world’s smallest violin is the official symbol of the nano state.
(The official currency features Jerry Seinfeld and the motto, “That’s a Shame.”)
Do they find these microaggression particles using a Harridan Collider?
I only care about Mike Rowe aggressions.
You forgot “inhaling.”
Don’t be absurd, Isophorone. Inhaling isn’t even the slightest bit aggressive; only exhaling is. 🙂
I’m forever ashamed that I didn’t realize I could’ve put “Rhyming” as the end of the list, instead of “Exhaling”, until an hour or so after I hit “Submit Comment”.
@3: Yes; being liberals, they’re looking for the Hugs Boson.
@6: No worse feeling in the world!
this microaggression wil not stand, man.
You forgot having a pulse and being male.
Raising one eyebrow.
@10 – Pretty sure raising any eyebrows at all is offensive to Whoopi Goldberg:
http://www.beautyhows.com/eye/eyebrow/whoopi-goldberg-eyebrows-has-no-eyebrows-does-whoopie-have-brows/
This is now my favorite thing, and I shall spread its good news forthwith. In a macroaggressive way.