This seems typical for any given club. But, as a former group exercise instructor, threads like this give me chills.
Some instructors don't seem to realize that they are there to teach and not to get their own workout. I don't go to spin anymore, but when I did I liked a variety of music, no disco or rap, and a ride that was not an aerobics class on a bike. In other words, a class like the one your male instructor teaches.
We had a couple of women who spun their bikes at such a high cadence that it is hard for me to believe they had any tension on their bikes at all. Perhaps they are just much, much stronger than me? But, what happens is that the participants see this, keep the tension off of their bikes, and start hiking their cadence to the point that they are bouncing around on their seats and not getting much benefit from this whole thing. No outdoor cyclist would ever ride this way! Sure, a series of progressive drills where you increase your cadence is fine, but 60 minutes of this super spinning is just going to blow my knees out. I have seen so much "wrong" stuff going on in spin classes, that it is disheartening, because most instructors never say anything to the people. They try to make a general correction, but are too afraid to address a person privately, but directly. Again, they are there to teach, and it doesn't seem to be a priority for many.