I don't really know what a social construct is. What is a scientific category vs a non-scientific category? And I don't think every item needs to fall neatly

I don't really know what a social construct is. What is a scientific category vs a non-scientific category? And I don't think every item needs to fall neatly into a category for that category to be useful. If I say 86% of african americans have a hypersensitivity to warfarin which means that if they were given the same dose as a white person they'd have a much increased risk of stroke. Clearly in the previous sentence the distinction of ethnicity is useful and the information makes people safer.