Peachromantic

Romantic attraction to everyone except bisexuals.
Heteroflexibles and homoflexibles are the exception to this rule.
Even though it is directly opposed to bisexuals, it is under the pansexual umbrella, which is under the bisexual umbrella.

"Hey guys, I'm peachromantic!"

"I'm pretty sure that's not a thing."

"Yes it is!! It means you like a little of everything excluding bisexuals."

"????"