i've spent a bit more time in fan spaces outside of tumblr in recent years (media-specific subreddits for instance can be useful to see people's thoughts on a manga chapter that was just posted, all in one place) and there are plenty of community differences which is cool but there's this one thing that always sticks with me about some places on these non-tumblr fandoms
and that's that there are people who genuinely don't get how shipping works. like they get the part where people enjoy a pairing of characters regardless of gender, but they do not grasp that many shippers don't care if a pair becomes canon.
to you, a tumblr user, this probably sounds fucking stupid. it does to me at least. being in a fandom you get used to shipping and how it works. even if you're not into shipping: you, tumblrina, get that shippers can be entertained by a character pairing for any number of reasons. for fan enjoyment, characters are clonked together like dolls (shipping and otherwise) and that's just one way to have fun in a fandom.
but out in idiot realm you see people say stuff like "the shippers of [pairing, oftentimes m/m or f/f] are so stupid bc [pair] will never be canon" or "[pairing] doesn't even make any sense and people who ship them are dumb". a complete misunderstanding of how plenty of shippers may or may not care about their ships vs canon.
i didn't really get it at first but there is another infamous fandom activity that changed my view of those people's comments and that is ....... powerscaling. that which uses microscopic dissection of canon and analyses it for twenty pages of debate. when you think about it, it's pretty much the antithesis to the creative bundle of activities that are shipping and creation (art, fic, etc). in stark contrast to extrapolating from canon and making your own thing, powerscaling debates ask of participants an encyclopedic knowledge of canon and exactly what is portrayed within it.
somewhere along the way, the concept of "i'll do what i want, even if it doesn't fit canon or even if it goes against canon entirely" became sacrilegious to some fans. illogical. unthinkable. and, of course, silly and beneath them - that guy has a crush on a girl, so he could never ever be into men ever, because he's straight. on occasion there's a dash of homophobia to it, but that's beside the point.
anyway powerscaling sons have fanfic too, like "could [character] beat [character] (2 hour long yapfest youtube video)" and "what if goku was betrayed and locked in the time chamber for a thousand years how powerful and jacked and shirtless could he become" so it's funny how many fans look down on doing the same thing (having fun making shit up) except for romance. because thinking about love is a silly emotional activity for dumb fucking girly idiots who don't get canon at all.