No. One can't choose who they are attracted to. And some bisexuals are not attracted to people who have gotten gender-reassignment surgery, who have taken cross-sex hormones, or just identify as the opposite sex, for a number of reasons which can range from disliking artificial bodily enhancements, gender incongruence, or people who can't accept their birth sex. There at least a couple topics(1,2) on the banned r/SuperBis sub about how bisexuals fit into the Super category.

Personally, I can accept 'enhancements' to sex characteristics or even the lack of certain characteristics typical to one's sex for whatever reason. But I can't deal with gender incongruence unless the person has differences in sex development; And most Trans don't.