Ellen Leanse, "'Just' Say No", women2.0 2/17/2014 (republished as "Un'Just'", LinkedIn 5/15/2015, and "Google and Apple alum says using this one word can damage your credibility", Business Insider 6/25/2015 — the quotes are from the Business Insider version):
A few years back I noticed something: the frequency with which the word "just" appeared in email and conversation from female co-workers and friends. I first sensed this shortly after leaving Google and joining a company with a high ratio of female to male employees. […]
It hit me that there was something about the word I didn't like. It was a "permission" word, in a way — a warm-up to a request, an apology for interrupting, a shy knock on a door before asking "Can I get something I need from you?"
The more I thought about it, the more I realized that it was a "child" word, to riff Transactional Analysis. As such it put the conversation partner into the "parent" position, granting them more authority and control. And that "just" didn't make sense.