It’s a kids’ T-shirt. I have seen some T-shirts that I consider “wrong” and/or obnoxious, but this is just incredible. According to the report K-mart took them out of their stores briefly after a complaint, but then resumed selling them.
I find it particularly repugnant today, because we had 2 recent deaths possibly due to domestic violence (one is still under investigation). Domestic violence is one of the leading contributors/causes of homicide. To make light of domestic violence, to make it a “joke”, goes way beyond “wrong”.