It’s instructive to contemplate the large number of monikers for peoples and ethnicity’s that are, at the same time, derogatory.
Three of my favorites:
Berber: from the Greek Barbarous (Barbarian/Foreign)
Slav: from the Greek Sklábos– slave
Vandals: both a moniker of the Germanic tribe and a ‘willful destroyer of what is beautiful or venerable’
A. Darius Kamali