The "pommy bashing" is something the media portrays in order to bring on the friendly rivalry tension and more interest to viewers.
In fact I often watched games in Oz pubs and find congratulations between rivalry clubs, and dont forget a significant number of Aussies even barrack for England during the games against them(they see it as mother country ? have strong links to UK ?? whatever reason)
I guess the diff between you and us is we dont make a huge deal of every victory as it happens on a regular basis and the novelty wears off.
You still think the Ashes "rightfully" belongs to you ?
Oh one more reminder - look at the reputation of British sports fans perceived by the rest of the world - enough said.