Saying that Latino is a contrived and artificial ethnic category implies that there are non-contrived, non-artificial ethnic categories. It's also not a great look to revoke people's race memberships based on voting results.
Sort of true, sort of reductio ad absurdumm because then you look at black Puerto Ricans and realize that they each individual has different material interests. Then you look at individuals and realize that they are also full of contradiction.
"The interdependence of the contradictory aspects present in all things and the struggle between these aspects determine the life of all things and push their development forward. There is nothing that does not contain contradiction; without contradiction nothing would exist." - Mao On Contradictoin: The Universality of Contradiction
Are there contradictions within the catergory "Latino?" Yes. Are there contradictions within EVERYTHING? Yes, and that is the basis of existing in the world.
"The relationship between the universality and the particularity of contradiction is the relationship between the general character and the individual character of contradiction. By the former we mean that contradiction exists in and runs through all processes from beginning to end; motion, things, processes, thinking--all are contradictions. To deny contradiction is to deny everything. This is a universal truth for all times and all countries, which admits of no exception. Hence the general character, the absoluteness of contradiction. But this general character is contained in every individual character; without individual character there can be no general character. If all individual character were removed, what general character would remain? It is because each contradiction is particular that individual character arises. All individual character exists conditionally and temporarily, and hence is relative." Mao On Contradiction: The Universality of contradiction: The Particularity of Contradiction
That's the reason she is also sort of correct. The basis of the universality of contradiction is the particularity of contradiction. Each more general form of contradiction is formed from the particular contradicitons within it., which means that to understand the universal, we have to understand the particular.