In life, it is difficult to impossible to sort people into “categories”. While it may be possible categorize actions that humans perform or the things they believe, people themselves are immune to accurate categorization.
For example, I often like to categorize the way a person is existing at any given moment. In my experience, I have noticed that people often either operate externally or internally. Internal existence occurs when there is a buffer between thoughts and actions or spoken words. External existence occurs when there is no buffer or a very thin buffer; thoughts about actions and things to say go smoothly and directly from the brain to the action performed.
When we are alone, we often exist internally. Rather than talking to others, our primary conscience thinks to itself. When with close friends, our thoughts almost become entirely external, rather than thinking to ourselves, we think aloud to them. When we are in the presence of someone with whom we must choose our words carefully, we operate both externally and internally: we are preoccupied with both carefully choosing the correct words, and saying the words themselves.
Though my categorization is probably somewhat inaccurate – people most likely operate on a spectrum of internal and external thinking – the idea is interesting. Perhaps a person’s public speaking skills falter when they exist more internally than externally during the speech. Or perhaps if they think more externally than internally, they fail as public speakers because they say things that were not thought out well enough. Perhaps this was Kanye West’s failure when he called slavery “a choice”; he simply had failed to process the thought internally before he verbalized it.