Does the culture war make some people vote againts their own economic interests?

Divide and conquer. For example, Trump's main legislation has been to pass a tax cut for the rich yet very few people seem to make the case for trickle down economics now.

Politics is not just economics and the other stuff matters too. Try a thought experiment though: imagine a world where people did not feel divided interests on race, gender, sexuality or cultural preferences. Perhaps the only identity left would be economic class. I think rich people and establishment politicians would be worried about that situation and they would try to create a culture war...