Jewish Law, known as Halakhah, governs every aspect of life and behavior, from what to eat, how to dress, how to observe the holy days, how to pray, how to conduct oneself in business, how to mourn the deceased, and how to relate to G-d, other people, and animals. Halakhah is based on the Written Law of the Torah, the Oral Law of the Talmud as compiled by rabbis, and custom. According to many Torah or Orthodox Jews, women rabbis are forbidden according to the rules of Halakhah. However, this is not exactly the case. There is nothing in Torah that explicitly or implicitly forbids women rabbis, while in the Talmud, there are certain rules proposed by rabbis, but their arguments are not very compelling. So the main reason for not having women rabbis is based on Halakhic custom. According to Reform Jews, this kind of custom is not binding and, since Judaism is thought of by Reform Judaism as an evolving religion, custom may and should bend according to the times.
With regard to celebrating gay pride during the Passover Seder, the holiday represents the liberation of the Jews from slavery in Egypt. However, Passover is not thought of as only a recollection of what once took place in ancient times. The Haggadah in fact is explicit in stating that each Jew bears the responsibility of talking about the liberation from Egypt as though it actually happened in their OWN lives in the PRESENT. The telling of the Passover tale is based on what G-d did for ME now, not only what G-d did for my ancestors. Further, during the Passover ceremony, there is often an identification with the struggles of other peoples from other countries and their fight against slavery down to the present day. It is not too much of a stretch, therefore, to imagine that any group of people who is presently oppressed or discriminated against and battling such discrimination is bound to be grateful to G-d for liberating them from their oppressors and helping them walk on a road toward a brighter future of freedom.