Yes I banned that user, because he consistently broke the site rules, and even kept breaking them after receiving a one week ban. Its really simple, if you dont follow the rules there will be consequences, if not other users will also be encouraged to imitate such bad behaviour.

The way rules work is pretty simple. Whenever you post in a community ending in @lemmy.ml, you are a guest on that instance and need to follow the rules in the sidebar, or face the consequences.