*Sigh* I try to stay polite, I really do. I've never admitted this before, but semi regularly on here I really *want* to post "Smack them upside the head, obviously they deserve it". I really, really don't mean that
, I've never struck another person and have no intention of starting now, but honestly it seems that some people are just colossal, giant JERKS who weren't taught the basics of playing nicely waaaaaaay back in kindergarten. These are the people who do get under my skin sometimes because honestly, who would do that? How can you reach adulthood without knowing that openly and publicly mocking the way someone sounds is cruel, makes you look like a massive donkey's behind to everyone in earshot, and is just flat out not acceptable?
I like Toots' suggestion (as usual
) and would also say that personally I would tend to stop laughing immediately, fix them with a clear, emotionless stare, say "Don't do that", and then go back to my previous conversation as if there were no interruption and without giving them a chance to reply for the same reasons Toots suggests.
On another note - I have a high pitched voice and sometimes someone will do the same thing to me. In my experience it has always been someone who is playing some kind of dominance game, at least in their own eyes. I find an immediate, short, public, emotionless response works for me - the words I use don't matter, I find, it's all in the manner. However, If your people are merely clueless then perhaps a later talk would be kinder.