The gay issue is part of it. But for my parents that is not their issue. My sister is not gay and they have continually walked in and out of her life.. In an especially hyporcitical move they shunned my sister for several years after she got divorced even though both of them have been divorced.
I would say what makes me more angry is they have no ability to reason things out or be objective. Sometimes I wonder how I ever came from them. Both my sister and I grew up in a cult and overall I think we have been successful in life.
Today it came to me they are like addicts. Addicted to religion like its a drug. Just like a drug, there are ways to safely use religion to better your life (if you are predisposed to believing in god etc). To much though has very serious side affects. My parents have overused religion for years in ways even their peers have not. There are so many ways to look at it that is just one of mine.
I feel better about it today atleast. Everyone here always has great insight on how to deal with issues.