Nate Silver has written a lot on his blog recently about how difficult it is to get people to think statistically. As an example, when he predicted Trump had a 30% chance of winning people complained that he was wrong because he had said Hillary would win and she hand't. Likewise, I fear that if you tell people that Group A is 20% more likely to X than group B what will be remembered is that A's do X but Bs don't.