A: all crows are stripy
B: Sir, you are a buffoon.
A: You're quite wrong, the earth is made of green cheese
B: the earth is self-evidently not made of green cheese .
A: You're wrong.
B: Isn't that a non sequitur?
A: Anyone who thinks the earth is not made of green cheese is clearly a buffoon.
B: You're wrong.
A: Sir, you are a buffoon.
B: You're wrong.
A: It is clearly not true that calling people names is unacceptable .
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: Anyone who thinks calling people names is not unacceptable is clearly a buffoon.
A: The evidence clearly shows that calling people names is unacceptable .
MoonShadow/FlameWar