That's actually really
Effort to provoke different types of answers follows:
Sure, we can be splitters and we can be lumpers. Let's be splitters for a moment. That is, given any group of people, we can always notice that they are pretty much like any other group of people. That will usually be true. We can even pay attention to which aspects of the group are most closely shared with the rest of the population.
But, we can just as easily do the opposite, can't we. That is, we can choose to pay attention to the things that make this group different, overlooking for a moment any similarities. Surely there must be something there, however vague or subjective.