As a child (maybe 9 or 10), I was asked by a classmate why I "laughed like that". That was the first time I was made aware that my laught was perhaps not exactly like everyone else's, though I can't hear the difference myself, but even if I could, it would be very difficult for me to alter what is a very natural and spontaneous reaction.
Such a personal comment upset me then, and to some degree still does.For that reason, even if I find a celebrity's laugh slightly annoying, I wouldn't dream of suggesting that they are putting it on, or of raising it with their employer.
That isnt a dig at you for starting the thread, Sparklefizz, or to anyone responding. I just wanted to answer from the laugher's angle rather than the listener's.