Saying that Gipsies and homosexuals were slaughtered by the nazis does not reduce in anyway the massacre of the jews.

Saying that the holocaust is no worse than the many massacres of other ethnicities or people that have taken place throughout history does attempt to reduce it as a more banal and/or mundane act of war, which it (and the parallel murder of gypsies and homosexuals) is not.

In the long run, we're all dead. John Maynard Keynes