it's really not. It's easy for some, sure and you're maybe one of them (or perhaps mistaken!) but many, many MANY people, especially men, even intelligent men struggle with social situations and maintaining healthy social relationships.
How long has it been since you called your long lost best friend and caught up? Did you go to his brothers funeral? Check in on him after his divorce? A year after his divorce? 5?
It takes effort and is far from elementary no matter how much rizz you have.