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: This idiot sent straight from writing articles about how Trump can't win the primary to how Trump can't win the general election.  He is just another idiot in his own fantasy land with no toe in the pool of reality.
A:
Yes