In what way?
What would be the “appropriate” response to the continued onslaught of USSR-type propaganda such as this?
You are lowering yourself to the level of these pseudo-scientists when defending your precious highly intelligent self. And they have a ready answer for you which is included in their “studies”: there are exceptions. No, dismiss them without becoming defensive, attack their weak points, ask for a race breakdown, for example, ridicule their conclusions.
You wanna be really effective? Attack the sources of their finances.