We have evolved from having our spouses chosen for us to choosing our own. Proposition 22 is not a hateful action. Proposition 22 would put into law that many of our citizens cannot marry the persons they want to marry. It implies that there is something wrong with gay couples, that they don't deserve the rights of married people. This sounds pretty discriminatory and hateful to me.
Gays already have civil rights.
Instead of marriage, they can have registered domestic partnerships or fill out legal forms. A domestic partnership registration does not provide all of the automatic rights and privileges that marriage provides. If it did, marriage of gays would not be an issue. Being married is the only legal way to assure that gay couples can enjoy the same legal benefits that heterosexual couples receive from marriage. Consider if, in the eyes of the law, your spouse were only your girlfriend or boyfriend.