A: all llamas are black
B: I don't know of a better way to put it: you're wrong.
A: Since you disagree with me, I can only assume you don't know enough about the subject. Go read a book, and don't talk about the subject any more until you agree with my views on it.
B: It should be obvious to anyone with half a brain that calling people names is unacceptable .
A: It is not evident that calling people names is unacceptable .
B: Sir, you are a buffoon.
A: You're wrong.
B: You're quite wrong, the earth is flat
A: The evidence clearly shows that the earth is flat .
B: It is quite obvious that it is not the case that the earth is flat
MoonShadow/FlameWar