I mean to be fair he isn't saying their friendship was "worthless", just that the strategy of picking up a surface level understanding of theory or intellectual subjects to seduce women (AKA pickup artistry) is "worthless" and ineffective. Which I guess is a semi revealing takeaway that he views that as the moral of the story...but its such a small quote I don't want to read into it too much.

Lets be real though: they weren't actually "friends" either.