Did I say possible? Sorry, definite.
I think I found the root of the issue. This isn't something you gleaned from actually interacting with people, its something you picked up in language class. I'll say it again, tact isn't cultural/national/racial. It's something you learn with interacting with others.When I was studying Japanese,
To your language point, every group has it's own linguistic bits that allow them to signal each other (My favorite is the southern idiom "Bless his heart") without appearing to be rude.