This is not an actual, literal ban on the word bossy. It's not. It's a catchy alliterative title to get the attention of a cause. Do I think "Ban B*tch" or "Cancel C*nt" would be great titles? Yes, but not only is that besides the point, we're not going to have a campaign aimed at the development of young girls use the word c*nt.
This is a campaign that is aimed at getting teachers, parents, and others to think and change the way they (and other children) describe young leaders. There are actual, scientific studies that show that young women are discouraged from being leaders while at the same time young men are encouraged. Ban Bossy comes from the fact that boys are told that they're being strong, while girls are told they're being bitchy. The point of the campaign is to have girls EMBRACE their leadership skills, not to be constantly put down by them.
And those who embrace bossy or b*tchy are great— but let's talk about how long they had to endure that to gain the confidence that they have now. For a 7-year-old girl who gets told she's bossy, or should let someone else lead the activity, she might not last long enough to embrace it one day.