I see your son as self absorbed and immature. When I was in college, I called my parents weekly. Those phone calls were really for my parent's piece of mind and I did the calls becaue they were paying for college.
When I was 22 and graduated college and moved cross country, I still called my parents weekly or even more often. Those calls weren't for my parents piece of mind but for my to stay involved in their lives. I wanted to know how they were doing, what was going on in their lives, if they were healthly, how the extended family was doing, what my sisters were up to. I cared about my family and wanted to stay in touch just like I cared about my friends and wanted to stay in touch with them.
OP, I'd be hurt if one of my children had so little interest in his or her family that they wouldn't ever pick up the phone to say "Hey, just wanted to see how you were doing. Did Dad finally decide which car he wanted to buy?" Part of developing a mature relationship with your parents is moving away from all conversations being focused on the child to a more equal relationship where both sides interests are discussed.