[artpepper2]

As I get older, there are fewer people I actively dislike, but I also have less patience to spend on people I don't actively like.

[erikpukinskis]

... which can lead to actually liking fewer people, because to meet new people you really like you generally need to spend time with people you only tolerate. The network effects work better with more overall socializing, and in my experience you can’t even hit the maintenance threshold (let alone the growth threshold) by only spending time with those you really favor.