Did Thor break a really important rule?

I know I played this game a little late, but it was on ps plus. At the beginning Thor and Odin visit Kratos, Odin offers him a deal, Kratos refuses, fight ensues. But in Greek mythology and Norse I think. Xenia (guest friendship AKA hospitality) is broken when Thor attacks Kratos whom accepted him into his home. Thus making Kratos a host and Thor a guest. And I’m pretty sure attacking a host was a big Nono. Anyways that's all. (And sorry for any wrong punctuation. English is not my first language. But you've probably heard that a million times)