Instead, it is used to describe someone who takes charge in a rude and disrespectful way. Examples include: giving others orders, shouting, emotional manipulation, tantrums, and so forth. Anybody who behaves this way may be "leading", in some sense, but they are not being a very good leader.
Conversely, a girl who leads her friends and peers in a kind and empowering way is not being bossy.
It would make just as much sense have a campaign to "ban douchebag" or "ban asshole", as these terms are disproportionately applied to men. And those terms don't apply to being a leader, they apply to being a rude, disrespectful leader.