Listen. GC is, in some small way, a microcosm of real life. On a message board, a college campus, on a job... there will ALWAYS be people with varying personalities. In real life, if you don't like somebody's personality, what do you do? Most likely, you DON'T TALK TO THEM.
Just because this is a message board doesn't mean it is your responsibility to lecture individuals on what YOU feel are their faults, personality flaws, and ethical dilemmas. If someone is sarcastic by nature (pointing to myself), you saying "Sarcasm is BAD!" will not make them change any more than me making this post will change what you believe if you don't already agree. Chill.