The way your OP is worded makes a response tricky webbo3 - I am unable to say if these solgans are 'offensive' - I can only comment personally, and say if I am offended. The wider context of something being 'offensive' infers that there is a definitive view of what is offensive, and someone can declare yes no, and everyone knows where they are.
This type of OP always brings polarised views - people who think it is wrong, and people who think that people who think like that need to lighten up / get a sense of humour etc.
The first I think is tacky - I don;t really feel comfortable with people declaiming their sense of humour via their childrens' clothing, I think that is wrong.
The second - taking issue really looks like reaching for an inference that i don't believe is either intended, or indeed viable. I read it as meaning that boys are boisterous, and tend to get into scrapes, because that is what boys do growing up. The notion that this infers an acceptance of sexually violent behaviour, I find frankly bizarre.