When the checks had trumps name on them during the pandemic they loved it. They don’t hate welfare on principle, they hate it when the propaganda tells them to hate it.
They love programs that benefit them, and hate programs that benefit the "wrong" people. Also, the definition of "wrong people" is very easy to guess.
The irony is when political advertising manages to convince people that a policy that would benefit them (because they're poor) would benefit someone they dislike (because they're racist), and they vote against their own self-interest.