"#girlboss" (and the possibly even more nauseating "#bossbabe") are what some of us feminists (oooo, scary word) describe as "empowerful": something that sounds superficially like it makes women more powerful or freer, but absolutely doesn't, instead actually contributing to making things worse for most women involved, trapping them even more firmly in the situations they're trying to escape or improve.
I think "empowerful" isn't the best term for this phenomenon, as it's used widely for all sorts of things and programs that are anywhere from helpful, to probably well-intentioned, to unironic examples of the very thing I described.
People who promote themself as some kind of a community leader beyond their actual role have a massive chip on their shoulder. If you report to them, you can bet that ego's going to be nauseating, including the random power moves.