The discrimination towards bisexual people for being bisexual.

Define that and give me examples.

If you're rude to someone based on something they can't control, race, sexual orientation, sex, etc. That is seen as discriminatory.

When someone spits on you in the street, yeah. When someone online says "you're a slut" it isn't.

rape and death threats

Gay males experience more actual death and rape. The only death and rape threats or actual actions that would happen to a bisexual are due to their homosexual side. When has a homosexual ever threatened to kill or rape you for being bi? This is what I'm talking about with real discrimination and hate.

Radfems have the idea of "political lesbianism" so you never really know which one of them is a real lesbian, but yes, some of them are. The basis of radical feminism and feminism in general was built by lesbians, radical feminism because lesbians assumed straight women were exactly like them. Political lesbianism is a gigantic part of radical feminist. Exalted radical feminist authors such as Sheila Jeffreys and Julie Bindel are political lesbians. Whether they are genuinely lesbians or not is moot because they believe lesbianism is a choice and they chose it, and so can all women.

There is no such thing as "bihet." .... the minority of bad bisexuals

History says otherwise, and unfortunately they are the majority of bisexuals. Just look at history. Societies where bisexuality was normal for 99% of the population. Compare that to now when bisexuals poll at about 30% of the population because homosexuals are more segregated from the general population and it's less acceptable to engage with them because now instead of being seen as normal, it's seen as being "one of them" even if one isn't. Though it's important to note that in these bisexual societies, homosexuals were treated much worse so this bit of segregation is a good thing. Homosexuals built communities from nothing.

The important part is this: what changed? Nothing changed biologically. Homosexuality has stayed at a pretty constant (approximately) 1% of the population. This is biologically necessary because most people need to breed. Nowadays with higher life expectancy and quality of life, our population is booming, so we really need to cool it on the breeding, but our biology doesn't know that. Still, in order to stay constant, almost everyone needs to have about two children, though we know with intellect (as opposed to biological urges) that more people need to have one or no children so we can gradually reduce the population.

In any case, the word "bihet" describes reality. Yes, these people are mostly (generally by a landslide) straight. They're also most people. This is biologically necessary to keep the population at least constant.