It's not that this certain someone is anti-capitalist. Establishment big business class has tentacles of influence that extends into the establishment politician class. Making enemies of establishment politicians made him the enemy of big business.

The depressing part was that a globalist billionaire (and not a particularly conservative one historically) was perceived as the only viable option conservatives had to disrupt the existing party cronyism. In 1992, that option was Ross Perot, also a billionaire, until the deal with Bush and the weird withdrawing and reentering the candidacy. The mainstream Republican Party has been generally disliked by conservative voters for a long time, but they don't have anywhere else to go, and Democrats' policy positions are completely unacceptable to them.