I think the point is that he talks to male strangers (regardles of race) about sports and it is good common ground that can lead to friendship. I do not open with politics, religion or race relations with strangers of any race. I do open with sports and continue with it if they are interested. I mean, can you imagine walking up to any stranger and going "how bout that black lives matter movement?" or "how about that Donald Trump?"
Admittedly, while not all my friends are sports fanatics, I do have a harder time finding common ground with strangers who are men, whether they look like me or do not look like me, if they are not into sports. Of course, people in general have trouble talking to people they cannot relate to if they do not have common interests.
I am sure IvanDiabloHorn's point was that sports is a good common for strangers white, black, etc in general to start with to get to know one another. I think he is saying we should keep sports as a common ground for all to learn and understand one another. If sports become divisive, we as a society become more divided. We have enough third rails as it is. We need more things that build bridges and bring people together. I am not sure why you want to pick apart this message.
Are you against people finding common ground with strangers?