The sterotype of actual scapegoat. Usually males are drawn as hairy blonde guys. When USA is mentioned (they call it as America not USA) it is always defined as villain.
A random anime girl: America! UHHHHHHHH DEMEE KEISHATSUUU SENPAI CATCH AMERIIKAANII SPIES ON MY ANIME!
Western boi: What USA there is not any spies on your Shoujo Yuri Anime.
USA weeb: YAYY! I HATE MY COUNTRY I am going to defeat America on Japanese Animes with my special genjutsu.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi