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: The Lefties are just gaining hold of our dear city.  People seem to be striving for stupid when they vote.
A:
Yes