starballbunny I discussed this with Dh last night afteri posted. I don't think this T-shirt is offensive as it may appear give the context of the scene to which it refers. I am a fan of Famiky Guy, I get it.
However, what we discussed was whether an average 12 year olds would look through the apparently racist, sexist, anti-Semitic humour & see the social commentary underneath. We agreed no & as a result this probably isn't suitable.
But, as someone who grew up watching Benny Hill, Jim Davidson & other 70s & 80s delights, I don't think that this t-shirt would give boys that age the idea you suggest. I think that we have much worse to worry about than that.
As the mother of a boy & a girl I intend to impart enough common sense by age 12 to avoid confusing cartoons with real life.