There is too much of a grey area for the definition of harassment in my opinion. As annoying as it might be for the kid on his end, people should be relatively free to do what they want as long as they are not breaking vital rules, like RDM,VDM, etc. Instead of making a rule that says you can't troll people in game like this, let the community take care of it self and push the toxicity out on its own instead of unnecessary authority being brought in. In many cases during history the more people are oppressed the more they would like to rebel and break rules/laws.