It is a tactic to denigrate others.
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Those who engage in such tacts {and many of them are right here on FR when hotbed issues arrise} do not have facts to support their position/candidate, so they post personal attacks on anyone posting any opposition.
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See how the threat of the race card causes even the strongest politicians to cower.
The name-calling is the same type of personal attack. It has several names, including the Clinton scorched earth and politics of personal destruction.
You can easily tell when a poster/propagandist is unable to post supportable data — they attack other posters rather than the contents of opposition posts.