College Republicans are mostly white kids who think no one but themselves get a raw deal. From their perspective, Asians don't belong here anyway and are stealing spots that should go to white kids. Ones that got into Berkeley are probably a little bitter at the Asians who kept them from getting into Stanford or Harvard.
From what I remember about the CAL Republicans is that a lot of them are Asian. There are many Asians who are very socially and fiscally conservative due to upbringing and culture while many from Taiwan align themselves with the US Right because of distrust of the PRC.