Part of the exercise was to always respond truthfully. I didn't make any distinction between omitting truth and actively lying.

I never really lied to people in the first place, but I would offer standard niceties. Those counted as lying and were no longer said. It's hard to say who was most offended. I can say that the least offended typically were somewhat antisocial themselves; those who found social norms something to analyze, rather than to follow.