I don't know how my comment killed a constructive debate rather than the comment that labeled my initial post "whataboutism" when it is something that objective

I don't know how my comment killed a constructive debate rather than the comment that labeled my initial post "whataboutism" when it is something that objectively does not meet the traditional definition. I really don't know how I am supposed to constructively dispute that without pulling in the actual definition from somewhere like Wikipedia.