Just when before posting a new thread or replying to a thread, I'd ask men and women to consider: would I discuss this in person in mixed company?
That's a standard for each person to consider. When someone posts something I think doesn't meet the standard of mixed company, I'll call them out on it.
If we want a coed/heterogenous organization, it's we start behaving as such in our FB page, FB group, and our Forum.