Why do some people shoot themselves in the foot by calling The President "Buckwheat"?

We can not forget the first amendment and the POTUS has been shown to be very thinned skinned when it comes to any kind of criticism. Name calling is not criticism and calling the person who called POTUS "Buckwheat" an idiot is not a criticism either. The source should be considered and then discarded as someone that is too immature to have the discussion. They may be a genius at insurance needs but, should stay away from political conversations.