I understand what you're trying to say, but I think you're making a false equivalence between socio-economic disparity and innate talent.

Imagine the same person, cloned. Clone A is born into an economically challenged household; while clone B is born into an upper-middle class household.

Now consider whether both clones would achieve the same results at A level.

One could expect the child born into the poorer household to experience more challenges, and perhaps achieve worse results as a consequence.

In this instance, how would it be appropriate to call clone A thick or less intelligent than clone B?