I found that the clowning/assholery in Seinfeld was just too close to plausible to clock as humor most of the time, while picking on small and petty things; it’s a little too real. I don’t think that comes from conceit, but rather, a generation gap and all the insensitivity that comes with it. Just add a little casual violence and it’s peak boomer-era humor. That said, Seinfield was its best when the stories were less believable and cruel.
The other shows you cite put these humor beats way over the top which is far more paletteable, IMO.