I'd say the best solution would be to add a toggle that disables attack animations of others in towns. With a second to disable sound emotes aswell since thats the next obvious harrasment tool.

Though, the easiest will most likely be to just disable abilities other than sprint in town, and knowing SE they always like to take the easy heavy handed rout.

In the mean time, report em and move on. Go into a housing district to do your shopping/retainers, I highly recommend the dappled stalls area of the lavender beds. ^^ Where I've been hanging out the last couple of weeks.