They seem to only be aggressive when you are on your mount. Dismount before approaching or else you will find your self thrown off and Stunned. Walking forward and backwards quickly allows you to "hula hoop" an attacking Micro, giving you time to dismount and avoid the stun.
My tribe mate got stunned by one these while he was peacefully getting ripped to shreds by 1 thyacoleo, a swarm of bugs and a pack of terror birds. Guess which one caused his death? The microraptor because it stung him and he couldn't fight back.
One time with my friend we were in a forest looking for those giant crystals, I think it was the blue one and a micro raptor took me off my mount and had me paralyzed in a yellow ball like thing. My friend was protecting me from threats
Much more annoying than Ichthyornis in my opinion. Been pounced by these many times off of my Baryonyx and nearly got shredded by a Compy gang. Their small size (barely larger than a Compy) doesn’t help either.