What is the mind complex/phenomenon of someone who believed everyone is the same called?

I am not sure whether this is a mind complex or not. I think it is a problem that some people have. Not looking for solutions only looking for a scientific specification for someone to be doubting the idea that everyone is different, someone who thinks we are all essentially the same. Whether it be a complex,... show more I am not sure whether this is a mind complex or not. I think it is a problem that some people have. Not looking for solutions only looking for a scientific specification for someone to be doubting the idea that everyone is different, someone who thinks we are all essentially the same. Whether it be a complex, phenomenon, or school of thought.
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