80% of the time, a shit/spammy post is clearly defined from it's content and gets the "shut the fuck up button" with no protests.

But what happens in the other 20% where a post being shitty/spammy is based on a subjective opinion. If one has a personal vendetta against a particular member or one does not like another criticising his post so he gives a 'shut the fuck up" instead! How does one circumvent this situation?