It's objectively true.

Republicans pass tax cuts which increase the burden on the poor and the middle class for the benefits of the ultrarich (not the majority of their voters).

They destroy government programs that benefit the majority of the population - health care, antitrust enforcement, free tax filing, environmental protections, tax audits of rich tax cheats.

They oppose any programs which provide benefits to the public - broadband standards, net neutrality, social services, cybersecurity, weather satellites, libraries, public schools, so many more.

The vast majority of their voters are hurt by these policies and are quite literally voting against their interests.