That person doesn't understand what reverse racism is.That's just racism. The term reversed racism does not need to exist.
And it doesn't need to exist, but no word 'needs' to exist, necessarily. Words are just tools to communicate when it comes down to it, so I'd say its a worthy term to have around, as it describes a specific phenomenon that would take a sentence or two to describe otherwise.
Its like saying 'a round object with a limited width intended for the use of rolling' instead of 'wheel'. Technically, we could get away without the term 'wheel', but its awfully useful.