I understand your point about some of the things that have been said about Trump. The level of crudeness in society (sometimes in the name of humor) has been reaching new lows since the 90's. I watch Morning Joe on somewhat of a regular basis and have not seen the episodes you reference above, particularly anything in regards to the First Lady. If you have a link to any of this on Morning Joe, I'd appreciate you posting it as I'd like to see it first hand. I have seen them question/criticize his competence, temperament, truthfulness, emotional maturity, etc., and for good reason, as far as I'm concerned. 
Regardless, the people you list are not PRESIDENT OF THE UNITED STATES, and that right there is why there is no justification whatsoever for Trump being crude, nasty, and petty when responding to criticism. His behavior degrades the office and the country.
As for Crum's post: What is uncivil about it? What do you take exception to?