In truth, I had the same reaction and I expect the downvoters are unacquainted with the associations to Nietzsche's concept of ubermench and its appropriation by the Nazi's as well as the phrase in the German national anthem "Deutschland uber alles" which was mistranslated intentionally by the allies for propaganda purposes (per Wikipedia: German grammar is sufficiently precise to distinguish "über alles" i.e. above everything (for me), from "über allen", meaning "above everyone else". The latter misleading translation was purposely chosen by the Allies during the First World War for propaganda purposes.)

Anyway, because of those associations, my view of Uber the company is that it has chosen to market itself for those better than the unwashed masses, the rabble, the hoi polloi. This may of course have not been their intent with their marketing, but that, FWIW, is where I go unconsciously when I hear the name.