Meh. There's an old story about a consultant, called in to a company because their machine stopped working. He came in, listened to the tale of woe, looked at the machine for a minute, took out a tiny screwdriver, and tweaked one screw on the face of the machine. It started right up. Company manager was ecstatic. "Thank you!" he cried. "Soon as you submit your bill, I'll pay it." The consultant took a piece of paper, wrote "Invoice" at the top, and wrote a line: "Consulting: $1200". "What!?" cried the manager. "$1200 for that! All you did was tweak one little screw!"The consultant took back the invoice, crossed out the one line, and wrote two new ones: "Tweaking: $5", and "Knowing where to tweak: $1195". The manager paid this bill.
The point is that directors are paid big bucks

for their judgment. A TD who "judges" that the letter of the law shall always be enforced won't
be a director long, as he will have demonstrated poor judgement.
What constitutes rudeness in any given circumstance is a matter of judgement, guided (one hopes) by common sense which involves among other things the local standard of behavior. Something might be considered rude in England, and not rude in the US, or vice versa. Or rude by an older generation, and not rude by a younger. IAC, it's pointless to argue it, particularly when the protagonists are arguing from their different viewpoints.