I just posted a fic with the tag "'top' and 'dom' are not synonyms" for...exactly this reason. (I have occasionally done weird things with AO3 tags, but I do try to make sure I get all the really informative ones in first.)

Did you see the search on spnstoryfinders a few months ago that requested Jared/Misha or Sam/Cas, but specified it had to be bottom!Misha because (and I quote to the best of my memory here) "Jared is so tall and it doesn't make sense for someone built like that to be submissive"? I just...