I've found gay activists become upset when one points out the harmful, unhealthy aspects of homosexual behavior. One's accused of being mean spirited, homophobic, hateful, unloving, etc., etc.
In fact, the loving thing to do is to point out when a person is doing something harmful to him or herself or to others. That's true when a parent sees his or her child doing something harmful.
It's also true when addressing issues on a societal level. One example is the issue of smoking. Another is homosexuality and homosexual behavior. Rather than promoting acceptance of homosexual behavior in schools or grant it social status and privilege via homosexual marriage, civil union or domestic partnerships, we should be discouraging the activity.
This point was made here in the context of the debate over recognizing homosexual unions in the Lutheran Church body, ELCA.