If it is so duh then why do so many cry bigot when it is brought up in polite company?
Because so few know that homosexuality is strongly linked with childhood psychosexual trauma. And many of those who do know that, or strongly suspect that, don’t acknowledge it because it doesn’t fit in with the family-destructive embracing of homosexuality as a lifestyle. Shame on them.
Whenever someone brings up the subject of homophobia to me, I say “Well, have you ever considered the possibility that it’s YOU who are heterophobic, not me who’s homophobic? And which do you think does the most damage?” That shuts them up pretty good.