It can't be denied but there are also racist groups in Super Sentai. I would like to list them as:
Vader Clan- They are from some weird other dimension who want to pollute the Earth.
Jashinka Empire in Dynaman- They considered themselves superior because of their tails and technology.
Hundred Violent Demon Tribes in Turboranger- Ragorn's group think they're way above humans so they bully them to no end.
The Vyram- They consider humans ugly and disgusting. Strangely though, Radiguet would fall for a human woman and make her into a Vyram.
The Gorma in Dairanger- Apparently they're racist against normal humans.
The Youkai in Kakuranger
The Orgs in Gaoranger
The Evorian in Abaranger- Apparently they're not as racially diverse as the Bandora Gang.
The Infershia of Magiranger
The Ashu- They consider themselves superior over humans.
The Gaiarc- They consider every other Braneworld inferior compared to theirs.
The Zangyacks- Well they're obviously racist that they think they can just thrash any planet of their choice.
The Zangyacks- Well they're obviously racist that they think they can just thrash any planet of their choice.