This prefix
uber-, particularly
rampant on
E2, is directly derived from the word
Übermensch, originally conceived by
Friedrich Nietzsche, and popularized by the German
Nazi regime, for whom it served to indicate the supposedly
superior White "
Aryan"
race, which, by virtue of its superiority, supposedly had the moral right to enslave and mass murder people of different ethnic origin.
(Note that über- as a prefix is not in general use in German. Its use is quite specific to the particular word, Übermensch.)
As a direct and - apparently - approving reference to racism, the prefix uber- is quite offensive to Europeans of older generations, considered in bad taste, and viewed as a sign of the lack of historic awareness among American youth.
Compare the (hypothetical) use of a prefix nigger- in German to indicate 'bad', 'of poor quality'. (Note: this is purely hypothetical! German does not use any such prefix as far as I'm aware. It used to have a prefix Juden- to indicate 'treacherous', 'untrustworthy', but that was before the war.)
Know your language.