Can you give anything close to a concrete example of this?
Even ignoring the indivisibility of the economic and social spheres (ask a black person if the CRA was an "economic issue" - ask a trans person if whether they can safely pee at work is an "economic issue"), and that it's not a zero-sum game (for example, the heightened scrutiny required by transphobia tends to cost more resources), I can't imagine there's enough meaningful work to "saturate" 100% of some candidate's time with economic issues. And as mentioned, the people who are furthest left and most vocal on economic issues are often the people furthest left and most vocal on civil rights. Conversely, people who spend a lot of time talking about how social issues should not be such a big deal (Peter Thiel, for instance - Paul Graham also, albeit with a much smaller platform) are the same who lean right economically.
How many examples do you need to see this is a false dichotomy? How many examples did you see to convince yourself it was a dichotomy at all?
> I can totally understand why working class people in the heartland who have never met any LGBT person, let alone someone trans or someone non-binary
I am not sure you know what those words mean ("any ... T person, let alone someone trans" is nonsense), but also, we're talking about people who live in Nebraska or Ohio, not hermits. We are long past any plausibly deniability to not even know a gay person - if you don't know any, it's because you're actively trying to avoid them.