PhilosophyMemes

Well, the reasons you give are better than most. Typically people that feel your compulsion to categorize are doing it to argue others aren't 'unbelieving' the right way or for the right reasons. Comedians cracking jokes that agnostics are cowards, hardcore atheists condescending any attempt at mysticism, mystics calling atheists blind immoral fools, and so on.

It's the same with leftism and how they constantly defeat themselves by splintering into subsets of people who aren't left enough or too centrist, etc... We live in a culture desperate to form cliques to our detriment imo.