Wiktionary
biphobia
n. antipathy towards bisexuals.
Wikipedia
Biphobia
Biphobia is aversion toward bisexuality and bisexual people as a social group or as individuals. People of any sexual orientation can experience or perpetuate such feelings of aversion. Biphobia is a source of discrimination against bisexual people, and may be based on negative bisexual stereotypes or irrational fear.