I did a quick Google search and saw 7200 for the average PGA course and 6200-6600 for the LPGA, took the middle for the ladies, and came up w/ a difference of ~800 yards. Either way, it's about 10% shorter of a golf course.
It's tough for me to reconcile people getting offended at a joke that insinuates Justin Thomas drives the ball like a lady when the ladies play on a shorter course to help compensate for their shorter average drives (and nobody takes offense). I can see how the whole menstruation thing might offend some people or be considered a bit crass, but if Tiger handed JT a pink bow or a white skirt I bet the same people would still be ****ed off.