VS University Students

I graduated from University around ten years ago. When I was a student, I often went to a room of my seminar professer. We discussed about many things. I could learn a lot. It was a good experience. Moreover, I sometimes drunk with him and other seminar students. And, we played soccer and tennis. We went for a trip together.
After I graduated, I have been to his house at least once a year with my friends. My professer talks about recent interests, his university and his students. I talk about my job mainly. It is natural for me to keep in touch with my teacher.

Last week, I went to an University in Yokohama, which is my customer. After a job, I talked with a professor, about his seminar.
He said to me, " I had invited my students to my house before ten years. I arranged a wine party with my students then. We enjoyed together very much. But, recently, I don't have such an oppotunity. Because, the personality of students has changed. They don't want friendly-relationship with their teacher."

"Not all students. Some students still want it. But, they often lose the feeling of respect or politeness to their teacher. They treat their teacher as like a friend. They don't understand our relationship as it order to be. So, I am losing the motivation to have a better relationship with them."
He looked to give up something.

For me, the most interesting thing of what he said is this.
"Compared with male students, female students are more active and friendly to their teachers in their unversity days. They sometimes come to my room and talk about many things. BUT, after graduating, they don't keep in touch with me at all. On the other hand, male students contact me more often."

I think what he talked about is not only his case. The distance between universtiy students and professers seems to be becomig far. I've heard of same kinds of episode from other professers.
I don't know the reason why the relationship between students and professers has changed.
Shyness? Generation gap?
The reason is not important, but what I think is important is that we should have a skill or an experience to communicate with the people in a different generation. Looking at younger coworkers, I realise they are not good at talking with older people. They tend to be together with same age people. It's not a problem itself, but if it implies the lack of their communication skill, it's fatal.