Stop ADULTS from being able to call innocent children RETARDS

My grandson was playing outside an asked the little boy Nextdoor whom I do believe is autistic if he wanted to play? The little guys said no my mom hates you! So my grandson who is autistic looked very sad so my daughter told him that’s ok you have mommy to play with you don’t need anyone else.. about 3 mins later here’s come the mom from Nextdoor saying keep you’re retarded kid over there my kind ain’t gotta play with you’re kid just cause he’s a retard the cops happen to be across the atreetbjewrd what was going on an told the lady just go in youre house but told us there is no law she broke calling a child an a child with a disability at that a retard it absolutely legal,,,,