@Chris Cardwell She's not racist though? Her one line implying that is pointed at Keepers, who are basically animals after what the Reapers did to them.
The closest she gets to racism is not trusting aliens to have humanity's back when we need them, that they'll let humanity suffer to save their own ass, and by Mass Effect 3, she's proven right.
If you have her with you when you meet the actual alien haters, Terra Firma, while you're grounded at the Citadel, then she goes off on them.
She's not speciest/racist/human supremacist, she just doesn't trust them to not screw over humanity in their own interests.