The other man's grass is always greener...
Ok, so one bisexual man treats you badly and that means all are shites? Isn't it a somewhat lazy preconception about bi guys to say they're all the same? Have all gay men treated you well in your life..?
I'm not getting annoyed with you, promise, but this is important. It pisses me off when people do not believe my own claim of self-knowledge, insisting they know me better than I do.
Bisexual people are a very small, misunderstood minority. It can be highly isolating, with shame and identity uncertainty stemming from cultural norms often displaying through negative stereotypes like hypersexuality or infidelity. People fetishise bisexuality - a very common male fantasy for bi women, which is seen as desirable in a way that male bisexuality isn't. Again, it's lazy and it's dismissive.
I'm not sure "bisexual privilege" holds water either. Bisexual privilege is the idea that bisexual people have the option to avoid the stigma associated with same sex attraction by ignoring it and pursuing fulfilling relationships with the opposite sex.
Research shows bisexual people face higher rates of suicide, illness and poverty than lesbian, gay, and straight people, and a lower allocation of resources within the LGBT community to address these issues. The issue is not “bisexual privilege,” but rather, my experience of being granted the straight privilege.
From my POV, I and my sexuality have been extensively denied and derided throughout my life, mostly by gay men. As I say, some will give the "bi now, gay later" line. Plenty of others have told me that I am disgusting and/or dangerous for my sexuality. If I am lucky, I am put in the "unicorn" category, which also pisses me off.
Being bi is not an "easy option". Walking down the middle of the road means dodging traffic from both directions.
Of course, underlying this discussion on both sides is a fuck-ton of toxic masculinity...