Yes, that's true. I think this is one reason I'm grateful I did languages to a high level, because you basically can't learn any language to any degree of fluency without, sooner or later, bumping up against stuff like this sooner or later, and it's just good training for being forced to think about things analytically/not making assumptions. Because when you do make assumptions, you end up making a complete berk of yourself by saying things you really didn't mean to say... ;)