[sc_rufctr]

Ian

It sounds like you tried... If he's an ass then you shouldn't invite him into your home.

Meanwhile... Build the wall and be happy. Let him rant. He can't make you do anything on your own property.

I would make it solid so that it blocks as much sounds as possible.

Cement fiber sheet over a wooden frame would be a good option.
Easy DIY and you can make it look like a rendered brick wall without the weight and expense.