It sounds like he never really thought about what becoming a parent means. You do have to give up things, that is part of the deal. I don’t have kids but I do have a sister that is 12.5 years younger than I am so know what having babies around is all about, it sounds like he’d never been around a baby before his son?
Not to be contentious, but I suspect that there might be a simpler explanation. Mr. S is a sniveling wimp and classic invertebrate liberal, a massive ego covered with quivering, tear-soaked jelly.