Trashing the President is also trashing the 63 million people who voted for him just like trashing Hillary is trashing the more than 65 million who voted for her. And it isn't calling it like it is unless it is applied with intellectual honesty. Criticizing policy positions and specific actions is fair game. But IMO trashing the president personally comes from childishness, ignorance, pettiness, and yes hatefulness no matter which side it comes from.
Have I ever been guilty of ad hominem criticism of a President. Yes. I am not proud of it, but I have done it at times too. But only in a brief adjective in a moment of anger. Not like the unbridled hatred some heaped on President Obama and certainly not the unbridled hatred heaped on President Trump.
The media, haters on social media, on message boards, etc. give extremely brief lip service to the accomplishments of the present administration if they cover them at all, which they often don't, but they are excessively mean, petty, sometimes cruel, often dishonest in their personal attacks on the President. It does not enoble us as a people when that happens.