It’s bullshit but if people categorize others based on those meaningless distinctions and act on it, that’s still a problem.

Completely agree

Compare a swedish guy to a samoan to an aboriginal australian to a mongolian to a subsaharian. It's pretty clear that humans are very diverse, the issue isn't in classification, it's in using the classification to support nefarious ideologies.

The false classification is the foundation of the nefarious ideology. So yes, the issue is the classification.

Humans are very diverse. The extent to which people are different or similar is not accurately captured by the race category. It is dangerously inaccurate.

Whether you believe that or not, there exist many millions who don't, and who treat others differently primarily on the basis of race.

The problem is that people are treating others differently based on a false categorization.

Hence the need to fight racism and racial discrimination, and to assist those who are excluded by it.

For everyone but the racists, yes.

I believe that even used to the definition of racism.

Indeed, anyone who believes race is a valid category is racist.