On a personal note:
Your friend is wrong, tell him that he should look up the answer himself, and leave it at that.
If you would like to grow as a person; state your opinion then leave it alone. Dont argue with people, for it gets you nowhere except leaving you upset or frustrated.
That said, I too have been sucked in by such stupid quests. I make mistakes, but have learned that arguing with people is pointless and leads to a overall loss of character.
A few weeks ago, I fell into this pit... A guy I knew said Christopher Columbus was a Jew. Now I dont judge people on what religon they practice, but I know that he wasnt a Jew... I tried and tried to get him to look it up, but he refused... after a 10 minute lecture of his very twisted version of history, I was left angry and frusterated... I lost the arguement by taking in part of it.
Mike