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Respectfully, bisexuality is a sexuality and not automatically a political performance.
A woman can't "claim" bisexuality and then have sex with both women and men. She just is bisexual.
Considering patriarchy, the way that men pressure and coerce women to "settle down with a man," the common self-hatred that bisexual women feel - including the fear that by existing and having feelings for other women, we might harm them because being bisexual is somehow "unclean" in some way - it's not fair at all to squint at bisexual women accuse them of being "exploitative and fetishistic."
There is also the very simple, very human situation of a bisexual woman having consensual, no/low-strings attached sex with another woman, that fizzling out, and then coming across a man that she clicks with and starts a relationship with.
Or are we saying that a bisexual woman who is rejected by a lesbian and then who eventually partners with a man is somehow offensive for... some hypothetical lesbian hypothetically thinking, "Actually, she's not for me because I want a girlfriend who loves rockclimbing and she prefers walking on the beach"?
I don't know how there's anything feminist about accusing bisexual women, the ones who are fetishised by men as being hypersexual and forever consenting, about being sexual deviants who exploit other women.
Even as a straight woman looking in from the outside, I can't help but be offended by women who claim bisexuality but say they are attracted to women and will fuck them but will only be in a committed relationship/partner up with a male. It seems exploitative and fetishistic.