These are statements that many people make casually but are deeply rooted in fundamental assumptions about the two genders.
I’ve found, after years of quiet observation that people who make these statements fall into 3 categories. They:
2. have a deep personal experience
3. hold a belief system
The very ignorant ones are mostly ignorant about many things but are usually quick to jump on the bandwagons, generally to appear trendy or be seen as supporting a seemingly popular faction.
1. Show empathy
2. Ask clarifying questions
3. Don’t defend men or women
On a more serious note, I find that letting them know that “wow, a lot of people believe this and I may be inclined to believe too, if you can prove it”.