I've seen this a lot in most forums. When a user miscalculate, misspell, or make a mistake, some wiseguy always talk down to them, making them feel dumb. People think they know everything. Well, I've got news for them. There is no such thing is a perfect person. Even they make mistakes sometimes. Calling them "IGNORANT" and "STUPID" is not what I call respect. You should always treat your fellow users with respect as you do in real life.