I see a lot of comments [in general on the web] calling people 'gay' when those people clearly had/are having both heterosexual and homosexual relationships. Things like "Freddie Mercury was gay" when Brian May attests that Mercury enjoyed heterosexual encounters too. The proper definition is bisexual then, it seems.

But perhaps the same reluctance to acknowledge those who seek homosexual relationships is present in people who call themselves gay, they won't acknowledge people as bi? Which seems like hypocritical bias against people whose behaviours are bisexual.

Maybe the behaviour you call out is because people want to have homosexual sex without being 'gay'. By which I mean without making that sexual activity the focus of their identity (I believe it's known as MSM)? It need not have anything particularly to do with societal disapproval.

Who one has sex with, and defining oneself by ones sexuality are quite distinct, as too are sexual desire and desire for relationships.

I'm interested in your response?