Apparently I have a lot to say on this. You could also try a very firm, direct "please do not say mean things like that to Polly" then when it happens again "I've asked you not to do that, please stop", gradually getting to a very firm "press do not speak to us if your words are going to be ugly"
You don't have to talk to him, could be it's the attention he likes, or possibly the only attention he gets, in which case "I really like stopping and talking to you Billy, but if you are going to say mean things, I won't be able to chat with you any more". And then leave.
If he's hollering across the street at her, I'd ignore it and depending on if I knew his family or not, I'd address it. Or I'd address it with him when I didn't have Polly with me
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Modified CG since Dec 2011
Growing out super short cut
High porosity, fine, unknown curl type, somewhere in the 2s at the moment
Mostly low poo
Current rotation includes:
Wash: Yes To Carrots -Condition: Yes to Cucumber, Nature's Gate Jojoba, One C - Stylers: Deva volumizing foam, Deva UDG B'Leave In, Foxy Curls Hi-Def Curl spray