To me being Phobic about something, you have to have an irrational fear of it to the point that it is interupting your daily activities. It used to be that to be called intolerant, phobic or bigoted, you had to actually do something mean or harmful to someone else or be behaving irrationally.
The witnesses black and white stance on homosexuality is extremely harmful to all the gay kids growing up in organisation. They are being told that their natural desire to love and to be loved is somehow evil. They are being told by their parents that they should never be in a relationship with someone whom they're attracted to because they're parents don't want them to die in the smoke and fire of armageddon which is "right around the corner".
It that's not an irrational fear - if that's not a phobia - I don't know what is.