You know family guy and robot chicken are both co written by Seth Green right?
Anyway, it was kind of mean. But like a lot of people said, if I was on family guy, I would be so happy no matter what they said.
I didn't know Seth Green was involved with Family Guy (I like it but I don't watch it regularly), though I used to think Seth MacFarlane was involved with Robot Chicken for some reason.
As far as being mean goes, this did seem a bit on the nasty side, rather than purely satirical.
The episode "Blue Harvest" had a parody of Green and his association with Robot Chicken. It was hilarious!