I can vouch for this. In my local Facebook group whenever a breed or gender question is asked I swear more people are wrong than right.

Every once in a while when I can't keep my mouth shut and comment the correct answer, people will disagree and it's just not even worth fighting back.

I always assume that they'll figure it out eventually and won't listen anyways. The only correlation that I can think of for beards and gender is that they inhibit wattle growth in both genders which can potentially make sexing a bit trickier. This is mostly an issue in Polish though