If you wore a baseball cap regularly would you feel more like yourself with the bill in front or behind you? This is more of a style division in the two kinds of people philosophy and doesn't include the practical reason of wearing the bill in front to shade your face on a sunny day.
It really makes sense that there would be only two kinds of people on this one. Either you keep your inbox tidy or you don't bother. That choice seems to be based on what people are most comfortable with while managing their emails.
There pretty much can only be two ways of placing TP on a standard style of holder. Which kind of person are you; sheets under the roll or over it? Usually people are quite strong about their preference on this, don't you think?
Even more dividing than preferred toppings or crust thickness, there are without a doubt "two kinds of people" when it comes to what to do with the crust. Some people love to eat it while others leave it be.
Have you noticed some people seem to be concerned about others while there are a few who seem to always be focused on only their own issues? It can be self-reflective to see which group we tend to fall into.
The whole concept of whether there actually are 'two kinds of people" also divides us into two groups, believers and non-believers of this concept. But then doesn't that mean there really are two kinds of people?