For some reason, things become slightly less enjoyable when the general public starts enjoying them.
I don’t know what it is, and I seriously can’t seem to help it, but I like things more when they’re still relatively small and low-profile. As soon as the rest of the world discovers “hey this is pretty cool”, I like it less. This is usually just a little bit, and not enough to completely turn me off whatever it is, but it’s definitely a seed that will eventually grow into full-on disliking.
It’s not so much about “before it was cool” as it is about how people interact with the suddenly popular thing. A fair amount of people can be obnoxious, and of course they’re going to be obnoxious when it comes to the thing. That’s not something I want to be a part of, or even associated with, so I distance myself from that as much as possible. I don’t want to be seen as just another one of those people who’s really into whatever.
Doesn’t help that I usually have strong opinions about what it does and doesn’t do right, and that that gets drowned out by the shower of praise newcomers give it.