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It sounds more a question of semantics to me, but I would regard an anomoly as nh a matter of democracy as a question of what fits the model we have and what does not fit the model we have.Since the model we have created is a model of what the bright matter does, then it follows that the dark matter must be the anomaly within that model. Maybe some dark matter intelligence has formed a dark matter model of the universe, and for them it is the bright matter that is an anomaly to their model, and maybe they and we should get together and compare models; but to our model, it is the dark matter that remains the anomaly.
I can't imagine such things as inhabited dark matter worlds exist.Conjectured dark particles such as WIMPS & neutrinos could not form atoms. Dark gas clouds are a non-starter & other forms of dark matter - brown dwarf stars, itinerant planets etc - would not be able to support life.
Yes. But the problem is: if we (minority) consider them (majority) as the anomaly and they consider us the anomaly, who would win in a global referendum? 
It is electromagnetism and its offshoots in the form of the strong and weak forces that create the interesting complexity in our universe.
I was talking abouut the observable small scale gravitiational interactions of dark matterIf for example there were another set of "dark electromagnetic" interactions that our electromagnetic interections could not detect and there was a complete complex "dark electromagnetic universe" with galaxies stars planets and life in parallel with ours we would be able to detect them by their gravitiational interactions notably there would be a significant excess of microlensing events associated with the locations of the dark electromagnetic stars and planets. OK the jury is still out on microlensing but we should have much more siginificant statistical results in a few years.
Perhaps it is us who are the anomalies !