Word describing brownie points that one receives from her peers for expressing outrage at a socially frowned upon act: affirmation
affirmation:
something affirmed
affirm: to
assert (as a judgment or decree) as valid or confirmed
[Both Merriam-Webster]
And the OP's example:
If I were the first person to communicate the unpleasant odor
associated with a stinky turd hidden in a room full of people in a
professional setting, I would win brownie points, i.e., the
affirmation of the group, for both being "courageous" enough to voice my displeasure and for experiencing the displeasure along with
the group.
Addendum: Affirmation focuses on what the speaker receives from the other members of the group in positive terms: the brownie points constitute affirmation. If the OP is instead trying to characterize the behavior of the speaker and the group in negative terms, as judged by an independent third party with opposed values, I would consider words such as the following:
reprehensible:
very bad : deserving very strong criticism
disgusting: so bad, unfair, inappropriate, etc., that you feel annoyed and angry
objectionable:
not good or right : causing people to be offended
condemnable: worthy of a statement or expression of very strong and definite criticism or disapproval
All Merriam-Webster]
And so, for example, the behavior of the speaker and group providing affirmation in the form of brownie points is reprehensible.