I disagree that offensive humour normalises, maybe in some cases where its widespread an repeated but here the whole point is that rightminded people know its wrong
You inhabit a different world to mine if you think all right-minded people know that - or rather, that all people are right-minded automatically, without any form of societal pressure. Katie Price's disabled young son was the butt of jokes about how he would probably rape her. And not everyone thought that was wrong. Sure, fine, the shock value "is the point"... but so too is the fact that we live in a sexist world, and making nastily misogynist jokes in that world is somehow now expected to be fine, "because everyone knows that's what they are!" Um, okay. You really think all the young men this is aimed at know that? Seriously? Or is that a figleaf and an excuse for continuing misogyny under a new "lighten up, it was just a joke!" disguise? "I saw your boobs" at the Oscars last year was a prime example of a joke that was "too clever for most people to get!" Um, yeah. A bloke jokes about how many famous women's boobs he's seen, and it's women's fault for noting that this objectification is not okay because, obviously, his unmentioned and unstated intention wasn't to laugh at women getting their tits out, it was to mock the sexist paradigm of Hollywood film-making.
There's another thread on AIBU which (correctly) challenges the way in which TV presents women hitting men as somehow okay, when that would no longer be the case in a soap if presenting the reverse. It's taken campaigning and work to alter attitudes to domestic violence against women in mainstream drama (and I agree with the other thread's OP that work needs to be done in making it equally unacceptable towards men). When I was a kid, Dynasty showed marital rape as justifiable - the perp was a hero and his wife's evil twin refusing him sex while impersonating her. My mother sat me down and went through why this was so appalling, though in retrospect I'm pretty staggered such material was shown pre-watershed on a Saturday... then when I was a young teen Corrie showed a sympathetic character blackening his wife's eye, and she in turn was shown as provoking that and using makeup to worsen the impression. I remember women's charities kicking up a huge stink with the latter storyline, and I also remember them being told they were just giving Corrie publicity and that ignoring it would be better.
Those saying that were wrong. Cultural acceptance in tv drama of intimate partner violence towards women has been vastly reduced, and the manner it's shown altered from the victim-blaming of the past, and that happened not by ignoring and pretending it would go away, and thus in actuality colluding, but by challenging, campaigning and educating. We went from Dynasty, to the McDonalds, then to the Jordaches on Brookside and Trevor and Mo on EastEnders, and you can track changing social attitudes with that evolving attitude in mainstream popular culture. But ads such as this, and jokes such as the Katie Price ones, show more needs to be done. And it is being - hence the petition, and the complaints.