Attitudes to previous human species show us a lot about racism, and how easy it is for us to perceive others as inferior. There is a view of these humans as hunched and hairy, little better than apes, when in fact they were people much like ourselves. The fact that they are now extinct, quite possibly wiped out by our species, means that there isn't anyone to defend them and it is easy to project our ideas of an inferior race on them. Scientists tend to classify these people by brain size, even though there is such a range of brain size in our own species and it isn't any indication of intelligence, it makes us feel better to be the ultimate expression of evolution.
We know so little about these people that is very hard to draw any conclusions at all, I think the denisovans are only known by a few finger bones. Some of our best information comes from fossilised trackways (footprints).