There are two distinct and polar opposite reasons for why a very broad cross section of our nation is coming out against trump vs those who stated negatively re Obama.
The racists and bigots who hated that a black man was president gave no time for Obama to preside.  Their hatred was based exclusively on Obama's skin color and the false narrative that Obama was a Muslim and not an American (see trump's many birther statements etc).
On the other side, we all hoped that trump would catch on to public office and public accountability.  He has failed- miserably.  Now he has dismissed his two economic advisory councils- the CEOs that he heralded as his critical support to bring jobs back.  At first, he said many other CEOs were lined up after (the black) CEO of Merck resigned. Then he dropped both groups.  We can only surmise that trump's small ego is more important to him than economic growth.
As mentioned, respect and trust are earned.  Respect the Office but the individual must earn cred