I try not to post too many of these maps as they are often gratuitously nasty and extremely unscientific. However, in the spirit of fun here is every state's least favorite state by Matt Shirley.
As a "helpful" device, Reddit user u/ayitasaurus made an arrow version. It gets a little hard to read on the east coast (a different color arrow would help) but you can certainly see all the silly state rivalries. Some interesting trends include the linear hate chain from Minnesota to Tennessee and Florida hating itself.