I've been in a situation like this before..
If you're talking "shit" about someone that you know or just think may hurt you, you should not be surprised if they decide to attack you over it. Depending on how much "shit" you said behind his back and to his face, you could've severely aggravated him to a point where he'll kill you.
If you truly continued talking "shit" as mentioned both by Garo and Cudder, you're actually the one that broke a rule.
However, I have not watched from either Cudder og Garo's perspective, so I have no clue how much "shit" was actually said, which makes me go neutral for now.