According to wikipedia, Gardner demonstrated an aversion to homosexuality, claiming that it brought down "the curse of the goddess" .
The citation is Gardner, Gerald B (1954). Witchcraft Today. London: Rider and Company. pp. 69, 75.
The witches tell me 'The law always has been that power must be passed from man to woman or from woman to man, the only exception being when a mother initiates her daughter or a father his son, because they are part of themselves' (the reason is that great love is apt to occur between people who go through the rites together.) They go on to say: 'The Templars broke this age-old rule and passed the power from man to man: this led to sin and in doing so it brought about their downfall.
-Gardner, Gerald B. Witchcraft Today (1954)
"Gerald was homophobic. He had a deep hatred and detestation of homosexuality, which he regarded as a disgusting perversion and a flagrant transgression of natural law....'There are no homosexual witches, and it is not possible to be a homosexual and a witch' Gerald almost shouted. No one argued with him."
-Lois Bourne, (one of the High Priestesses of the Bricket Wood coven) Dancing with Witches. (2006)