It's not the riches per se that they take issue with. In fact, they admire and celebrate rich people who got there by hard work, luck, and good business (just like apes in /r/stonks celebrate how rich DFV got on GME options). What they take issue with is how certain powerful people use their riches and power in ways that benefit only themselves and hurt everyone else (who isn't rich) -- particularly the power establishment in Washington, New York, and Silicon Valley.

To give one specific example, private equity firms have been buying out small local businesses on a massive scale (like veterinary clinics), jacking up the prices, paying the workers less, and giving customers a worse experience.

That's not the sort of thing they perceive Trump to be doing with his riches and power. In fact, I don't see any way Trump is messing with the macroeconomy in his own business practices (do you know of any?).