So I assume your blindness to the possibility of condescension from someone indicating that another countries cultural norms are nothing more than a peculiar id

So I assume your blindness to the possibility of condescension from someone indicating that another countries cultural norms are nothing more than a peculiar idiosyncracy, thus indicating that their own cultural standards should be considered to be the norm, must be just a quirk in your character and nothing to really take particularly seriously then. (note, this comment is meant illustratively)