IMHO, the solution is very simple, the offended individual should then post the fuller context and show the citation to have been selective and out of context. This will not prove the intent to decieve, but it will contribute to the discussion more constructively. I've had to do similiar many times over. If they are unable to do that, then your wisdom in their participating in a less disturbing area should be followed.
I hate it when I travel. I miss all the good parties...