You do realize if race played no role in marriage, there would be no white people, asians, blacks etc. everyone would be one bland color- sounds kind of boring to me.
People are not racist if they dont date you because you are black, green or purple. Many ashkenazim refuse to date sefardim and visa versa. Some people like yellow cars, some people like blue cars. Are they shallow, possibly, it all depends on the situation.