In cases where some kind of details matter, you can often substitute the hobby though.
If it’s cycling, you can probably substitute something else that involves hours away with fellow devotees, expensive equipment and silly outfits. Golf for example. But just say it’s cycling. People will sympathise.
If it’s building model planes, it can be something else that involves tinkering in a shed, buying tat, and going to events sporadically. Loads of things fit that general description.
If it’s crochet, you can just say so (or substitute knitting). In fact, most crafts can be described as knitting/crochet. That way your AIBU about the growing stash of materials or the proliferation of half finished projects or the unwanted homemade gifts etc will still make sense. You don’t have to specify that it’s some obscure craft that you and three other people like doing.
If, on the other hand, the details are so specific that you can’t explain without naming the super obscure activity, you’re probably on the wrong forum.