Good point, making a sweeping characterization that most Latinos and Blacks are uneducated in no way appears racist.  And as always, you are correct, it is always proper to respond to a perceived attack by engaging in the same conduct.  Since you believe others have referred to certain white groups as uneducated, you are completely justified in characterizing any non-white group you wish in the same manner.  As Jesus taught, turnabout is fair play.