It's likely a suck ass spot to be in. Being independent contractors, I don't think they're protected by many of the labor laws that employees have. There may very well have been nothing ADR could have done but smack the guy. Maybe racial harassment is viable for independent contractors, but it wouldn't surprise me if it didn't apply to them. More than likely, even if he could have filed a suit or some sort of complaint, doing so would have cost ADR either a decent spot. He'd have become as relevant as Zack Ryder.
If they WWE wants talent to handle things more "professionally" in a way befitting a corporate workplace, they can't tolerate some of the shit that goes on there. You want to keep guys that throw around slurs, look the other way when someone takes issue and handles it old school style in five seconds.