Your fourth option is perfectly acceptable to me: exercising free speech right to say that original post is a terrible thing to say. However, we should not enfo

Your fourth option is perfectly acceptable to me: exercising free speech right to say that original post is a terrible thing to say. However, we should not enforce the "no discussion whatsoever": if either the original speaker or another person wants to argue that it was not in fact a terrible thing to say, let them.