*Opening a can of worms*
I remember hearing a theory about male homosexuality:
Theory: that about 2/5 of male homosexuals are so inclined because they have dissociated themselves with the male role in relationships - usually because of an abusive or negligent father. In this case, they are in part either misandrists (because of abuse) or effiminate (because of neglect).
If such a theory were accurate, it could be that the particular gay man, who hates gays may be acting out of a resentment of paternal abuse (if his father was gay).
I've heard similar arguments. A past trauma has caused someone to no longer want to be the "man" in a relationship so they turned gay. The "evidence" that people use to support it is gay conversion therapy. They make the assumption that since some gay people receive treatment for past traumas and then claim to be ex gay, that it must be proof that the trauma caused their homosexuality. Ludicrous and lacking any scientific method, not to mention potentially harmful since it provides an avenue of social stigma, but what can you do?
Even when dealing directly with gays who experienced trauma in their childhood from a male figure, the "cure" rate according to Nicoli from NARTH was about 1 in 3. Now consider that is the population of gay people who have trauma, not the gay people who don't have trauma. And to be "cured" you had to not engage in sexual behavior with people of the same sex. It had nothing to do with whether or not you were still attracted to them, only whether or not you engaged in sexual behavior with them. So a celibate gay was considered cured.
But I digress. There has been no conclusive study that has indicated that people who were sexually abused as children by a male figure were anymore likely to end up gay. If there had been, then we wouldn't be having this discussion. Organizations like NARTH would love to support gay conversion therapy with that kind of evidence.
I am not well aquainted with the gay community - but is it relatively common for gays to hate gays?
It's common for gays to hate gay culture.
That being said, I met a man on another forum who went by the name of JustTom. If you ever want to see firsthand where a lot of my animosity for religion comes from, then PM me and I'll send you a link. JustTom was the first person I met who genuinely hates gays. He is a Christian who is gay himself but went through conversion therapy to be "cured". He hated gays so much that he wanted the death penalty for sodomy. Now when I encounter gays who hate gays, I have 2 questions.
1. Are you Christian?
2. Did you go through conversion therapy?
100% of the time, the answer to both of those questions is "yes". That leads me to believe that conversion therapy aims to blame a past trauma for homosexuality and therefore instill a hatred or anger towards it. Once you start hating a part of your own identity, you start hating others who share it.