Trump, to almost everyone's surprise, wins. So how do big government, big business, elite experts and so on, i.e., the establishment, react, from his fans' perspective? Without even giving Trump a chance, they decree that he is illegitimate, that he needs to be resisted, and that his voters are beyond redemption; "this is 1932 in Germany" was not a rare reaction.
So, from these voters' perspective, the one time in their lifetimes and much longer a president comes around who really speaks to their worldview, the establishment tries to destroy him. Rather than the anti-Trump sentiment persuading them, it makes them stronger supporters, people who see Trump as their weapon against an establishment that disparages them.