I don't run multiple OSes, but I do use USB sticks and SD cards on other people's computers and vice versa. I'm pretty sure that is "normal user" behaviour.

It gets annoying real quickly because you see the "crap" files of all the OSes you're not using. And you delete them, you only have to insert the stick and they're back. This happens in different ways for all of Mac, Windows, Android and certain Linuxes.