> This is definitely not true for poorer gifted students: - whose parents may not even know anything about the field that the student is interested in - whose parents may see higher education as a waste of time or have other anti-intellectual views like a sizeable chunk of the US

Why are you assuming that because the parents are poor they are automatically ignorant or anti-intellectual?

poorer kids will be more affected by family attitudes because they will be less likely to be in a well funded school system with sufficient support for gifted kids