Hello, George Carlin.
I am posting this because one of the biggest problems in the world is people getting butthurt when people crack jokes, burn flags or do other entirely insignificant shit that doesn't lessen the value or importance of the issue or item being scandalized at all, but somehow ends up making people really really angry anyway. Do you really think any QC fans will suddenly think it's okay to beat their wives or husbands because they read a joke about it in a webcomic, or are you simply taking this as an opportunity to get all high-and-mighty and/or righteous? Because honestly, it seems like the latter.
It won't cause QC readers to go out and beat their significant others, but it does contribute to a cultural viewpoint that it's funny. For example, a man being raped. We make lots of "Don't drop the soap jokes" when talking about prison, but rape, including for/especially for men, is an utterly terrifying thing to endure. The view of male rape being funny, what started as "just making light" of it, has contributed to a rape-survivor support system that, for the most part, excludes men, both as counselors and as clients. It also contributes to the arguments of those asswipes who call raped men "pussies". It enshrouds boys and young men, especially, from reporting molestation and childhood sexual abuse. In this case,
laughing about it contributes to the already-present viewpoint of men as exclusively batterers, and women as exclusively battered. (which particularly affects the already-downtrodden gays and lesbians; women can beat their wives, and men can beat their husbands... it's not gender exclusive.)
However, in this situation, I think the girls just pick on Marten. If he wants it to stop, he should put up some boundaries, and Dora and Faye, not being abusive, would not cross those boundaries. (Premonition: forty-seven Faye angst strips on hurting Marten.) That is where, I think, the line is drawn. When told to stop, a normal person stops after the first indication of displeasure. An abuser carries on.