The dyslexic kid next door keeps putting little notes through my door. They are all offensive name calling.?

I am absolutely sick of it. "Shoot for broons" I get that a lot "You fit blistered" That one gets on my nerves. "Go flick your muger you strapid fit pug" The personal attacks are the worst. I put a note through his own door for his mothers attention. I explained what he was up to as she is at work until late. She replied with a note that I found the next morning. It said " My sin wood nut do such a thong so go flick your shelf you fit twot" I never realised that she also had it. I came across a book on dyslexia yesterday. It was written by a dyslexic and I thought it may help, so I have popped it through their door. It is called "Dyslexia for begonias.