i guess that depends on what you're qualifying as obsessive behavior. people interact with their interests in different ways and their standard for casual interest is probably just different from yours. like, i enjoy drawing already, so if there's a show or game with character designs that i like, i'll probably draw those characters. same goes for people who make music, write stories, etc. people also make communities around common interests (like, for instance, a lego building game) so they can make friends and talk with people who will understand the topic. (also this is probably why tumblr ended up being such a good place for fandoms, the tag system is pretty easy to work and it lets people really casually engage in communities without much effort)
it does makes sense that you might get frustrated if you can't follow those conversations ofc, tho that doesn't mean they're doin something wrong
