I don't think that we can really just complain about every time a gay person is portrayed as feminine in an ad - feminine gay men do exist (despite some people's concern about their reproductive capabilities). It may seem out of balance because masculine gay men are never read as such in ads so people assume that there are no portrayals of them at all. But if these two actors played the role in a way that wasn't recognizable as a gay stereotype, would any of the people complaining now have given them credit for portraying gay men as straight-acting?
The real problem isn't gender expression, but the desexualization of gay people on television. There's nothing implied here between these two men, which is fine, but maybe other ads that show a couple could show a same-sex couple every now and then? That's unlikely because, while gay people don't get turned off by the sight of an opposite-sex couple, straight people do get turned off by the sight of a same-sex couple. A least-common-denominator industry like advertising knows that that power imbalance exists and they're only going to reify it.
Here's one of the complaints, which is insulting to me as a gay man who loves feminine men:
One complaint to the ASB said: "The two characters were being portrayed as gay men with horrible stereotypes that inaccurately portray gay people and is both inaccurate and offensive to gay men."
And here's Westpac's response, which is insulting to me as someone who doesn't like to be bullshitted by PR flacks:
It said: "Since launch, we have had some resounding positive feedback, with very high preliminary awareness and recognition figures especially from the gay community who have embraced the humour and its intent and congratulated Westpac on our depiction of these characters."
Yes, I'm sure the humor has been "embraced" and they were invited to grand-marshall pride parades and dozens of gay people have already told them they're naming their first-born children "Westpac" because of this truly ground-breaking performance that could quite literally end all homophobia.
What are the chances they've heard from even one person who doesn't work for them?
On a related subject, is this ad for a collection agency? Why are "business solutions" ads always so vague and new-agey that it's hard to know what they're selling?