The reason God despises when we show favoritism is because the Lord Himself doesn't show favoritism! If God Almighty doesn't show partiality or favoritism to people, who are we to think that we can place labels on people and treat them more favorably then other people? We should be eternally grateful that the Lord doesn't show favoritism because He allowed salvation to come to the gentiles. If God showed favoritism, perhaps He would have only made a way for the Jews to be saved.