Express a negative opinion about Trump as a president, mentioning his tendency to blame others for his mistakes and his lack of qualifications for the job. Also mention Hillary Clinton as a better candidate.
But you're not sick & tired of Trump whining about everyone & everything and blaming all of his mistakes on everyone but himself?  Not to mention taking credit for things he had nothing to do with, like Fema's readiness to deal with catastrophes, which was done by Obama's order, during his presidency. 
By any reasonable, fact-based yardstick, Clinton was the better candidate and certainly would have been a better president. He'll, my 14 year old cat would be a better president. Trump is a terrible president; the worst we ever had and that is saying something.  We'd all be much better off - and not on the threshold of nuclear war - if the big-mouthed idiot for whom you voted kept his idiotic, thoughtless, unbelievably stupid, incendiary mental ramblings to himself.  Talk about showing what kind of person you are.