What races? Give me the formal names
Conversations about racial differences always end up as pointless semantic debates.
Every attempt to divide humans up into groups is doomed to failure. There will always be exceptions and anomalies. What groupings somebody uses depends on their purpose. All systems are of course social constructs but they reflect real things.
A doctor considering a diagnosis of sickle-cell might have a more nuanced system in his mind from a policeman who has been asked to look out for an IC3 male.
We fear that paying too much attention to what distinguishes one group from another leads to discrimination. It is a legitimate concern. It's uncontroversial to observe that exceptional athletic ability is more commonly found among men whose ancestors originate in sub-Saharan Africa or that people from China are more likely to be lactose intolerant. According to some contributors to this this thread asking why some groups have more variety in hair and eye colour is highly controversial!
Should investigating questions about other potential differences be taboo for science? I'm not certain either way.