*raises eyebrows*
Authenticity is paramount. I don't share your view that the majority of offence or outrage is feigned. Then again, I suspect our countries have some cultural differences around such things.
I can see what he might be getting at, though, especially when it comes to overtly public displays of offense or outrage. Some people tend to spread it on a bit too thick, which can cause one to doubt one's sincerity.
Usually, what I do to try to gauge someone's sincerity in outrage is to ask whether they're outraged over what someone did or whether it's over what someone said.
I would also ask whether their outrage is consistent with a set of principles or whether they're just jumping on a bandwagon because they perceive that everyone else is outraged, too.
Sometimes I wonder, whenever someone calls attention to some obscure blog or a newspaper that few people actually read and proclaim "This is something to get OUTRAGED about!"