Why do asians have to be oatmeal raisin?

This is the lyric I am referring to:
I got a thing for Milano, Biscotti ItalianosAnd I never turn down some Oreos if you got thoseButter Pecan Puerto Rican,
Or them Oatmeal Raisin Asians.
Hazelnut Brazilians,
Macadamia Caucasians,
Double stuffed or thin mint
It don’t matter you getting it
Cause I got a sweet tooth that’ll never come loose
And the fact of [...]