So apparently he has talked to you about it before and this time since you did not head him being nicer he took it to the next level to get results. So in return you are not just going to be cool you are going to egg him on to see what level he takes it to next......
And what if he just does it legal and calls the police over and over and over again and then shows the reports to your landlord? No offence man but actions like yours are why people get shot and beaten all the time. You do not know what the limits or minds of other people are like, he could snap and take it to far, all you can do at that point is wonder why.