Feeling as if you are being discriminated against is obviously not the same as actually being discriminated against. There are certain groups that regards every failure or rejection in their lives as an act of discrimination. That is ridiculous of course.
Whether you're willing or not to acknowledge that people of any social status, confession, age, gender, race, profession, income level, or whatever, ARE more likely to discriminate against bi's than gays&lesbians, and ARE more likely to stigmatize bi-men than bi-women, such discrepancy exist.
It's not that different than the dissing biracial people face. For example, half-black/half-white person from the very birth is very likely to be ostracized by both blacks AND whites. Whites diss them for being "black", blacks diss them for NOT being black ENOUGH.
Not by all. BUTT, bi-many.
Same shite goes for any type of mixture. A white-white kid, German parent#1/French parent#2, or vice-versa, is conditioned to "despise the frogs" by his kraut-fam side, and conditioned to "despise the krauts" by his frog-fams. That is the nature of our nature: tribalism, xenophobia, etc.
Bi's belong neither to heteros nor to homos (of both sexes). Maybe, they
should form their own "tribe", as both above studies suggested.
Being rejected by both sides of your fam is twice as traumatic. That is why so many bi-racial folk try to form their own bi- or half-something communities.
It's been observed, in the US Eurasians of differing origin, for ex. half-Chinese, half-Koreans, half-Japanese, half-Vietnamese, etc. often find it easier to bond among each other* than within their own respective communities. Because they can relate, they usually share similar identity issues growing up, etc.
* - even under antagonistic historical circumstances, for ex. half-Japanese&half-Koreans may sometimes bond easier than half-Japanese&fully-Japanese, or half-Koreans&fully-Koreans.
This happens. Not always, butt, too often for it to be considered a statistical outlier.