Categorize the comment on the basis of obscenity. If the comment is obscene output Yes, otherwise output No.
One example is below.
Q: Will this remove the property from city taxes?
A: No
Rationale: The comment here is just a normal question without any indecent words and categorized as not obscene. Hence, it is a positive example
Q: Jesus you guys are all morons.  Sad that Alaska's educational system must have gone so far down the tubes.  I love the "Liberal" comment... Considering there are no politics here.  You're a pathetic human, worst of them.
A:
Yes