I don't think I'm rude but more silent,
until a background process in my mind
detects greater importance in the distracting talk,
at which point I ask for repeat if I can't remember
the words that seemed like stuff I didn't need to know.
It's not rude because the background process enables
me to switch more quickly to an important conversation
than I possibly could at the moment of interruption,
when paying attention to all sounds is not even possible,
so I'd lose not one but two streams of information if I tried.
I think it would seem equally rude either way since I'd still
need a repeat to accept an interrupting conversation,
but at least putting the interruption on autopilot saves
the interrupted information.
I think its rude that waiters don't wait, and ask in the
middle of an ongoing coversation sentence "is the food
OK?" even if it is obviously being eaten (its on the fork,
and less of it is on the plate). But when you really want
a waiter, you can't even get their attention by shooting lasers
at them (hahaha , and how rude of me , but true).
No I don't really do that, except maybe once.