I've never found this to be true, women usually do their jobs and when they're hardasses men can't handle it and call them a bitch...behind their back.
On the flipside it's the guys banging their secretaries/workers and having their wives show up at work to bitch them out for fucking said secretaries/workers.
I have found secretaries to in general be incompetent but that is mostly because it is a relatively high paying job with low education requirements, they also happen to usually be women.
p.s. OT will agree with you though, they are the ones talking...behind peoples back.