Ok Im sitting outside and everytime I am out here my neighbors are yelling at eachother! It could be so peaceful! Is it ok to yell shut the fuck up? maybe? not really in my nature...
Tape them then mix music to it maybe like David Holmes (Let’s Get Killed) or put some classical music as a background then send it to them in the mail.
They may get the message if not you would have done something constructive an may have some fun on the way.