They win elections on shutting down his headquarter plans. They want to break up his company, raise his taxes on unrealized capital gains, they want to force him to divest his personal investments like WaPo.
Same goes for other billionaires. You think there's a lot of love for Ken Griffin? Or the Google founders? Or Jamie Dimon? Of course not.
Billionaires are a common bogeyman for the populists that have ruled the capitol for the last 10 years or so.