I think it's his actions in publicly "outing" himself that the parent is referring to rather than being gay itself. Dealing with prejudice like homophobia head-on is something most CEOs aren't well known for.

Why people believe it is something genetic? People are not animals, we're not controlled by our genes. The difference between a dog and a human just can't be counted. It is just psychiatrists pushing this idea that taking drugs, violence and perversions are natural.