badthingfactory may have been waiting for a more tactful time to say it, rather than blurting out "You're full of it, I did that for you!" in the team meeting.
While such a thing may be true, and may need to be communicated to a manager, it probably looks bad to do it in front of one's peers.
Why did you applauded his behaviour? So you could blame the method (which you didn't follow) later?