Literally, all the #NeverTrump Republicans loved Breitbart until this year. I can remember many of the #NeverTrump folks I know from my personal experiences in politics memorializing him profusely when Breitbart himself died.
That's because there is a huge difference between Breitbart the man and Breitbart the newspaper. Andrew Breitbart would be rolling in his grave right now.
The same Andrew Breitbart who called Occupy protesters "rapist scumbag freaks?" Andrew Breitbart had and would today have no right to oppose Trump considering his own beliefs and his own personal rhetorical style. Breitbart and company are the exact archetype of the Republicans who fostered the conditions that Trump ultimately exploited. It has nothing to do with Trump's personal or political disagreements. These Breitbart/Ted Cruz/Marco Rubio "True Conservatives" are in fact nothing more than a giant Potemkin village for the party establishment that quite literally almost destroyed this country during Dubya's presidency.