In my professional life, I dealt with many political figures, governmental agency upper staff, and academic figures. When involved with those people in dealing with issues in relation to improving public education, I often encountered people who were acting in a presumptuous manner, or not acting in a manner contributing to school improvement,
I always let them and everyone else involved, know how I felt by addressing the pompous or unhelpful person by his or her first name -- hot by Mr. or Mrs. by Dr., or by his or her title Believe it or not, it did help in tearing down the differences in status they were trying to foist and maintain and it did help in making them more cooperative.
I, therefore, suggest that we always refer to Donald Trump my his first name or by "Trump -- not Mr. or President. That way he will clearly understand that he is no better than the least of us and that his behavior has earned no respect from us.