[Ammi]

..I think it's because of what has always been conditioned to be 'norm' which is heterosexuality.. so homophobia is much more easily detectable and much more apparent..heterophobia would be harder to see and recognise and because heterosexuality is seen as the 'norm' by many, it can also be more easily dismissed as something else as well.../and not being something linked at all to discriminating against sexuality ..but for me it would be almost impossible for it not to exist to a far, far lesser extent than homophobia...