Bullshit. Most LGBTQ people consider sexuality on a spectrum, not a binary "gay" vs "straight". Someone might identify as a gay male or lesbian female without being exclusively into the same sex. She's somewhere on the spectrum, but chooses to identify as "lesbian" so other women will see her as LTR material (if she's "bisexual", she might want to fuck a penis later!).

Being bisexual doesn't mean they're sick of players or unwilling to betabux. When they complain about past men, it's usually part of her discovery that she's more into women than men. She doesn't like male dominance the way "straight" women do. She didn't get much out of being with men. The sex was mediocre. The relationship dynamic didn't feel right. They don't do as much for her as women do. She realizes she's not wired like other women. That's not running away from Chads and avoiding betabux. It's starting off dating guys because that's what social expectations told her to do, then just realizing she's less into dudes than other girls are.