On the accents thing: context is everything. There's all sorts of circumstances when imitation isn't mockery at all, just being funny, sometimes even affectionate. Alistair McGowan (who I don't know whether or not is internationally famous, so maybe talking about someone only UK\Irish viewers will have a clue what I'm on about) as well as Bird, Bremner and Fortune (who I'm fairly sure are) are two examples of this. I'm not too bad myself - I've always done a mean SA accent and can take a decent stab at plenty of other places.
However, it appears fairly inescapable that, given we know there's bad blood between Hayden and Sharma, imitation will indeed be mockery. I don't accept that Australian (or Brit, or USAn, or wherever else) imitation of Asian accent is automatically a problem, though it wouldn't surprise me in the slightest if there are indeed Australians who do it in a manner I'd deem unacceptible, ie which would be basically along the lines of the old Blackface "entertainers" - inferring inferiority while impersonating. I'll stress: I don't know for certain that there are, it's just the impression given to me by Jono, Dasa and duffer. It's a shame Manju has such a hatred of long posts, else his input here would be most interesting.
I would condemn Hayden because the imitation is done in an obviously condescending context (I'd say indisputable there because it'd be fairly futile to deny there is bad blood between him and Sharma), not automatically because he's an Australian imitating an Asian accent.
