Doesn't sound like you can reason with these parents, and you shouldn't try. I don't think it's OK to just sit back and take their abuse... if you learn to accept abuse like that, you'll probably start believing half the things they say.
From my uninformed perspective, I see two separate problems: the abuse of you, and the abuse of him. Sounds like he's still living with his parents, so that's hard to get around. But you...who's forcing you to come in contact with them? If you get harrassing emails, set up a filter to reject them (or just reply with a "form letter" type thing saying, "The MRC e-mail system has rejected your email for offensive content. If you wish to contact your intended recipient, please compose a civilized email").
If you simply avoid all contact with these people, you'll take away one of their outlets for their disappointment/anger, and they'll have to deal with their own son. That is to say, as long as you're there for them to blame, they're not going to see that their problem is with their own son.
Don't just sit back and let yourself be beaten down for this.
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