Once again for those finding it difficult: if you are sexually and romantically attracted to someone and then find out they are bisexual, to suddenly be sickened or turned off or whatever else, IS BIPHOBIC
In my opinion, being Biphobic would be if you chose to hate/not associate with/not be friends with someone on any level because they were Bisexual. I would find that very strange.
However, choosing not to be their life partner or to have sex with them is a very different matter, because you need to find them attractive and their sexual preferences are tied up in that.
It doesn't matter whether you found them attractive before, and then didn't - people are allowed to change their minds, if new information becomes known. Some women have found out that their husbands are cross dressers for example, and have chosen to end the relationship.
You could apply this to literally anything. For eg. I would not be attracted to men with :
Bald head
No teeth
Very overweight
Shorter than me
Tiny hands
Poor hygeine
So, maybe that makes me :
Baldphobic
Toothlessphobic
Obesephobic
Shortphobic
Tinyhandsphobic
Smellyphobic
Unless you want to think up a name or label for every preference, why not just accept that some human beings will not be attracted some other human beings, for a million of reasons, and there's nothing to be gained by wagging fingers and screaming "PHOBIC", because it makes no sense, is frankly rather rude and childish, and every woman has a right to choose who she has sex with for any reason, without being labelled as "PHOBIC".