Kings Cross has not been the centre of the gay community in Sydney since the 1970s.
Darlinghurst is the centre of the gay community, although Leichhardt is big with lesbians.
It's also not quite right to say that Kings Cross was a working class suburb. It was originally a wealthy suburb, but from the early 20th century began attracting bohemians, artists, writers, migrants and anybody else who didn't like suburbia.