For some people they choose to follow trends not because it’s something they care about but because it’s what everbody else is doing.
And once the trend dies down and is no longer as popular they stop following it too. They only joined in because they wanted to be a part of something.
Then you get other people who don’t follow trends at their height. They wait for things to slow down and then determine whether or not it’s something they’re even interested in.
Sometimes it turns out they don’t really have an interest in the trend so they don’t participate. But other times they find themselves enthusiastic even when things have died down and thats when they choose to join in.
I suppose it’s just about discernment really but that is something that takes practice.
Perhaps one day you won’t have to wait until it’s no longer trendy to figure out if you’re really interested.