It’s because regressives only have a few plays in their playbook.

"Conservatism consists of exactly one proposition, to wit: There must be in-groups whom the law protects but does not bind, alongside out-groups whom the law binds but does not protect.

The law cannot protect anyone unless it binds everyone; and it cannot bind anyone unless it protects everyone."

Trans people are the new constitutionally unprotected out group. So far, they can legally be discriminated against, and those who vote republican will focus on that. They won’t focus on how they’re being failed by the Republicans in economic matters.