All versions of Acrobat honor all passwords contained in a PDF. But, the PDF format itself treats passwords as advisory. So, it's a format issue, which means that any given client may choose to honor the passwords ... or not.
Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.