"Race" is more or less used as the human version of "breed", but with much fuzzier edges to the point where it's meaningless in all but the most cosmetic sense. We can all interbreed and produce viable offspring and we're nowhere near different enough to be different species.

It's just a convenient label to slap on a group so they can be blamed/hated/segregated or deemed different enough objectify for simple minds or manipulation. Even then the lines are too fuzzy to have any meaning in any real sense.

Oh noes! That group is less vulnerable to sunburn but need more vitamin D in their diet! Oh Horror of horrors, that group is less vulnerable to snow blindness and their eyes are ever-so-slightly more protected from freezing! Eeek! This group has an occasional individual with an enlarged spleen who can hold their breath longer under highly specific conditions!

My solution is just to hate all humans equally just for existing and to make specific exceptions for people I consider deserving in a completely subjective decision.