Expecting a partner to at least be in a similar economic position as you is entirely reasonable
This is an entirely mundane and uncontroversial statement that will cause some flack in these spaces - but in my opinion, expecting your partner to at least be in a similar economic position as you is entirely reasonable and something more people should require.
You see a lot of responses to studies saying more women tend to prefer a partner of economic status, and some responses range from “see? Hypergamy!” To being a a bad day is two away from calling her a golddigger, and that is often met with “well men don’t require it!” - maybe more men should
Having a similar economic background at the bare minimum means your work ethic and potential goals matches theirs, your lifestyles expectations are in a similar place and it also means one partner won’t be actively dragging another around. Basically, it puts you on a spot where you can take care of yourself and occasionally do something nice for your partner within a capacity they can expect.
This statement tends to get flack and be used to support the whole hypergamy debate and angle, but imo it is a very reasonable expectation and it does not ‘prove’ any RP talking points
EDIT - felt the need to add this since a couple of comments brought it up. This is only referring to the beginning of a relationship, as one grows and changes so do circumstances and even choice. One partner might get a promotion, another might quit to be a stay at home parent. The philosophy when selecting a partner, and when maintaining a relationship are not the same.