one day, I messaged him, but he is offline

Hello, I was playing rugby with a chat mod "mannybakshi" and he scored a goal, I was isida healing him, so after he scored a goal, I said n1, which literally means nice one. For that thing he warned me. I had no idea what was wrong in that and hence I became frustrated and abused him, and then he banned me. I know that I got banned coz i abused him, but he shouldn't have warned me in first place, that was a completely illogical warn. I did not say a thing other than n1 i.e nice one before that one. I would've accepted the ban if it was justified but in this case I believe the mod is also at fault. Please review this.