The comparison to bald people is silly, since bald is purely a physical characteristic and not a culture; any commonalities are coincidental. Just like people of any culture can be 6 feet tall.
On the other hand, behaviors can be attributed to cultural background, and that does sometimes mean that people belonging to a certain race or ethnicity can be expected to behave in a certain way. For example, Asians are usually close talkers.
Understanding cultural differences and learning to accept traits in others that are unlike your own is embracing diversity. Attributing random (negative) behaviors as being part of the cultural makeup of a certain race or ethnicity and then expecting to find those behaviors in others from that group is racism.